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<SEC-DOCUMENT>0000897069-07-000381.txt : 20070213
<SEC-HEADER>0000897069-07-000381.hdr.sgml : 20070213
<ACCEPTANCE-DATETIME>20070213093723
ACCESSION NUMBER:		0000897069-07-000381
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20070213
DATE AS OF CHANGE:		20070213

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NATURAL GAS SERVICES GROUP INC
		CENTRAL INDEX KEY:			0001084991
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL, GAS FIELD SERVICES, NBC [1389]
		IRS NUMBER:				752811855

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-78868
		FILM NUMBER:		07606214

	BUSINESS ADDRESS:	
		STREET 1:		2911 SCR 1260
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79706
		BUSINESS PHONE:		9155633974

	MAIL ADDRESS:	
		STREET 1:		2911 SCR 1260
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79706

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KEELEY ASSET MANAGEMENT CORP
		CENTRAL INDEX KEY:			0001056504
		IRS NUMBER:				363160361
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		401 SOUTH LASALLE STREET
		STREET 2:		STE 1201
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60605
		BUSINESS PHONE:		3127865000

	MAIL ADDRESS:	
		STREET 1:		KELLEY ASSET MANAGEMENT CORP
		STREET 2:		401 S LASALLE ST STE 1201
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60605
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>cmw2618.htm
<DESCRIPTION>SCHEDULE 13G
<TEXT>
<HTML>
<HEAD>
<TITLE>
</TITLE>
</HEAD>
<BODY>


<TABLE WIDTH="100%" CELLPADDING="0" CELLSPACING="0">
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     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TH>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TH>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TH>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TH></TR>
<TR>
      <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT> </TD>
      <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT><HR WIDTH="100%" SIZE="2" ALIGN="Left" COLOR="Black"></TD>
      <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT> </TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD>
     <TD COLSPAN="2" ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">OMB APPROVAL</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD></TR>
<TR>
      <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT> </TD>
      <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT><HR WIDTH="100%" SIZE="2" ALIGN="Left" COLOR="Black"></TD>
      <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT> </TD></TR>
<TR VALIGN="TOP">
     <TD WIDTH="65%"><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD>
     <TD WIDTH="19%"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">OMB Number:
</FONT></TD>
     <TD WIDTH="15%" ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">3235-0145
</FONT></TD>
     <TD WIDTH="1%"><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1">Expires:
</FONT></TD>
     <TD ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">February 28, 2009
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD></TR>
<TR VALIGN="TOP">
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1">Estimated average burden <BR>&nbsp;&nbsp;hours per response
</FONT></TD>
     <TD ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE="1"><BR>. . . . . . . . . . . . . . . 10.4
</FONT></TD>
     <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT></TD></TR>
<TR>
      <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT> </TD>
      <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT><HR WIDTH="100%" SIZE="2" ALIGN="Left" COLOR="Black"></TD>
      <TD><FONT FACE="Times New Roman, Times, Serif" SIZE="1"></FONT> </TD></TR>
</TABLE>
<BR>


<!-- MARKER FORMAT-SHEET="Head Major Center Bold-TNR" FSL="Project" -->
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION<BR>Washington, D.C. 20549 </FONT></H1>

<!-- MARKER FORMAT-SHEET="Head Major Center Bold-TNR" FSL="Project" -->
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SCHEDULE 13G </FONT></H1>

<!-- MARKER FORMAT-SHEET="Head Major Center Bold 1-TNR" FSL="Project" -->
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Under the Securities
Exchange Act of 1934<BR>(Amendment No. ___)* </FONT></H1>



<TABLE WIDTH="750" CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER">
<TR VALIGN="BOTTOM">
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT></TH></TR>
<TR VALIGN="TOP">
     <TD WIDTH="100%" ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>NATURAL GAS SERVICES GROUP, INC.</B> </FONT>
<HR WIDTH="70%" SIZE="1" ALIGN="Center" COLOR="Black"></TD></TR>
<TR VALIGN="TOP">
     <TD ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">(Name of Issuer)
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR><B>Common Stock</B> </FONT>
<HR WIDTH="70%" SIZE="1" ALIGN="Center" COLOR="Black"></TD></TR>
<TR VALIGN="TOP">
     <TD ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">(Title of Class of Securities)
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR><B>63886Q109</B> </FONT>
<HR WIDTH="70%" SIZE="1" ALIGN="Center" COLOR="Black"></TD></TR>
<TR VALIGN="TOP">
     <TD ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">(CUSIP Number)
</FONT></TD></TR>
<TR VALIGN="TOP">
     <TD ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><BR><B>December 31, 2006</B> </FONT>
<HR WIDTH="70%" SIZE="1" ALIGN="Center" COLOR="Black"></TD></TR>
<TR VALIGN="TOP">
     <TD ALIGN="Center"><FONT FACE="Times New Roman, Times, Serif" SIZE="1">(Date of Event Which Requires Filing of this Statement
</FONT></TD></TR>
</TABLE>
<BR>


<!-- MARKER FORMAT-SHEET="Para Flush Lv 0-TNR" FSL="Default" -->
<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Check the appropriate box to
designate the rule pursuant to which this Schedule is filed: </FONT></P>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>[X] </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Rule 13d-1(b)</FONT></TD>
</TR>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>[&nbsp;&nbsp;&nbsp;] </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>Rule 13d-1(c)</FONT></TD>
</TR>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>[&nbsp;&nbsp;&nbsp;] </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>Rule 13d-1(d)</FONT></TD>
</TR>
</TABLE>
<BR>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=4%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>* </FONT></TD>
<TD WIDTH=96%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>The
remainder of this cover page shall be filled out for a reporting person&#146;s initial
filing on this form with respect to the subject class of securities, and for any
subsequent amendment containing information which would alter the disclosures provided in a
prior cover page. </FONT></TD>
</TR>
</TABLE>


<!-- MARKER FORMAT-SHEET="Para Flush Lv 0-TNR" FSL="Default" -->
<P><FONT FACE="Times New Roman, Times, Serif" SIZE=1>The information required in the
remainder of this cover page shall not be deemed to be &#147;filed&#148; for the purpose
of Section 18 of the Securities Exchange Act of 1934 (&#147;Act&#148;) or otherwise
subject to the liabilities of that section of the Act but shall be subject to all other
provisions of the Act (however, see the Notes). </FONT></P>




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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(Continued on following page(s))<BR>
Page 1 of 8 Pages </FONT></P>

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<BR>

<TABLE WIDTH="760" CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER">
<TR VALIGN=TOP>
<TD WIDTH="100%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 </FONT><HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
<TR VALIGN=TOP>
<TD WIDTH=100%>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>CUSIP
No. 63886Q109</B> </FONT> <HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
</TABLE>
<BR>

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<TR VALIGN=Bottom>
     <TH ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
     <TH ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
     <TH ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
     <TH ALIGN="LEFT"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
     <TH ALIGN="RIGHT"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT> </TH>
</TR>
<TR VALIGN=Bottom>
     <TD WIDTH="10%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
     <TD WIDTH="10%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
     <TD WIDTH="10%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
     <TD WIDTH="60%" ALIGN="LEFT"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
     <TD WIDTH="10%" ALIGN="RIGHT"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
</TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>1</B><BR><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>NAMES OF REPORTING PERSONS<BR>
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)<BR><BR>
<B>Keeley Asset Management Corp.; Tax I.D. No.: 36-3160361</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>2<BR><BR><BR></B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="3"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)<BR><BR><B>Not Applicable</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
     <TD ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">(a)&nbsp;&nbsp;&nbsp;[&nbsp;&nbsp;]<BR>(b)&nbsp;&nbsp;&nbsp;[&nbsp;&nbsp;]
</FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>3</B><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SEC USE ONLY<BR><BR></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>4</B><BR><BR><BR> </FONT></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CITIZENSHIP OR PLACE OF ORGANIZATION<BR><BR><B>Illinois</B> </FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>NUMBER OF<BR><BR>SHARES</B> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>5</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">SOLE VOTING POWER<BR><BR><B>-0-</B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>BENEFICIALLY<BR><BR>OWNED</B> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>6</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SHARED VOTING POWER<BR><BR><B>755,000</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>BY EACH<BR><BR>REPORTING</B> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>7</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SOLE DISPOSITIVE POWER<BR><BR><B>-0-</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>PERSON WITH:</B><BR><BR> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>8</B><BR><BR><BR> </FONT></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SHARED DISPOSITIVE POWER<BR><BR><B>755,000</B></FONT></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>9</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<BR><BR>
<B>755,000<SUP>(1)</SUP></B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>10</B>&nbsp;&nbsp;<BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="3"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES <BR>
(SEE INSTRUCTIONS)<BR>
<B>Not Applicable</B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
     <TD ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">[&nbsp;&nbsp;]</FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%">
</TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>11</B>&nbsp;&nbsp;<BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<BR><BR>
<B>6.3%<SUP>(1)</SUP></B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>12</B>&nbsp;&nbsp;<BR><BR><BR> </FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)<BR><BR>
<B>IA</B></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD></TR>
</TABLE>
<BR>

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<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(1) </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>The
  percent   ownership   calculated  is  based  upon  an aggregate of 11,968,444 shares
outstanding as of September 30, 2006.</FONT></TD>
</TR>
</TABLE>
<BR>


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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Page 2 of 8 Pages </FONT></P>




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<TD WIDTH=100%>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>CUSIP
No. 63886Q109</B> </FONT> <HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
</TABLE>
<BR>

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     <TD WIDTH="10%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
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</TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>1</B><BR><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>NAMES OF REPORTING PERSONS<BR>
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)<BR><BR>
<B>Keeley Small Cap Value Fund, Inc.; Tax I.D. No.: 36-3872373</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>2<BR><BR><BR></B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="3"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)<BR><BR><B>Not Applicable</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
     <TD ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">(a)&nbsp;&nbsp;&nbsp;[&nbsp;&nbsp;]<BR>(b)&nbsp;&nbsp;&nbsp;[&nbsp;&nbsp;]
</FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>3</B><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SEC USE ONLY<BR><BR></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>4</B><BR><BR><BR> </FONT></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CITIZENSHIP OR PLACE OF ORGANIZATION<BR><BR><B>Maryland</B> </FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>NUMBER OF<BR><BR>SHARES</B> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>5</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">SOLE VOTING POWER<BR><BR><B>-0-</B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>BENEFICIALLY<BR><BR>OWNED</B> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>6</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SHARED VOTING POWER<BR><BR><B>755,000</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>BY EACH<BR><BR>REPORTING</B> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>7</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SOLE DISPOSITIVE POWER<BR><BR><B>-0-</B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>PERSON WITH:</B><BR><BR> </FONT></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>8</B><BR><BR><BR> </FONT></TD>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SHARED DISPOSITIVE POWER<BR><BR><B>755,000</B></FONT></TD>
</TR>
<TR VALIGN=Bottom>
     <TD COLSPAN="2"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>9</B><BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<BR><BR>
<B>755,000<SUP>(1)</SUP></B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>10</B>&nbsp;&nbsp;<BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="3"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES <BR>
(SEE INSTRUCTIONS)<BR>
<B>Not Applicable</B> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD>
     <TD ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">[&nbsp;&nbsp;]</FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%">
</TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>11</B>&nbsp;&nbsp;<BR><BR><BR> </FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="90%"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<BR><BR>
<B>6.3%<SUP>(1)</SUP></B></FONT><HR SIZE="1" ALIGN="Left" COLOR="Black" WIDTH="100%"></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>12</B>&nbsp;&nbsp;<BR><BR><BR> </FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD>
     <TD COLSPAN="4"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)<BR><BR>
<B>IV</B></FONT><HR SIZE="3" ALIGN="Center" COLOR="Black"></TD></TR>
</TABLE>
<BR>

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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(1) </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>The
  percent   ownership   calculated  is  based  upon  an aggregate of 11,968,444 shares
outstanding as of September 30, 2006.</FONT></TD>
</TR>
</TABLE>
<BR>


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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Page 3 of 8 Pages </FONT></P>




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<TD WIDTH="100%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 </FONT><HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
<TR VALIGN=TOP>
<TD WIDTH=100%>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>CUSIP
No. 63886Q109</B> </FONT> <HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
</TABLE>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 1(a).</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Name
of Issuer:</U> </FONT></TD>
</TR>
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<BR>

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<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>Natural
Gas Services Group, Inc.</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 1(b).</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Address
of Issuer&#146;s Principal Executive Offices:</U> </FONT></TD>
</TR>
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<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>2911
SCR 1260 <BR>Midland, TX 79706</B> </FONT></TD>
</TR>
</TABLE>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 2(a).</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Name
of Person Filing:</U> </FONT></TD>
</TR>
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<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>The
persons filing this Schedule 13G are:</B> </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>(i)</B> </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Keeley
Asset Management Corp.</B> </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>(ii)</B> </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Keeley
Small Cap Value Fund, Inc.</B> </FONT></TD>
</TR>
</TABLE>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 2(b).</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Address
of Principal Business Office or, if none, Residence:</U> </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>(i)-(ii)</B> </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>401
South LaSalle Street<BR>Chicago, Illinois 60605</B>  </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 2(c).</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Citizenship:</U> </FONT></TD>
</TR>
</TABLE>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>(i) </B></FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Keeley
Asset Management Corp. is an Illinois corporation.</B> </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>(ii)</B></FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Keeley
Small Cap Value Fund, Inc. is a Maryland corporation.</B> </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Item 2(d).</B>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Title
of Class of Securities:</B> </FONT></TD>
</TR>
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<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>Common
Stock</B> </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 2(e).</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>CUSIP
Number:</U> </FONT></TD>
</TR>
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<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>63886Q109</B> </FONT></TD>
</TR>
</TABLE>
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<BR><BR><BR><BR>

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<TD WIDTH=100%>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>CUSIP
No. 63886Q109</B> </FONT> <HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 3.</U> </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>If
this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the
person filing is a:</U></FONT></TD>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>                   [_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Broker
or dealer registered under section 15 of the Act (15 U.S.C. 78o). </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>                   [_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Bank
as defined in section 3(a)(6) of the Act (15 U.S.C. 78c). </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>                   [_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Insurance
company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c). </FONT></TD>
</TR>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>                   |X| </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Investment
 company  registered under section 8 of the Investment Company Act of 1940 (15 U.S.C.
          80a-8).  </FONT></TD>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>|X| </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>An
investment adviser in accordance with section 240.13d-1(b)(1)(ii)(E).  </FONT></TD>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>[_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>An
employee benefit plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).  </FONT></TD>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>[_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>A
parent holding company or control person in accordance with section
240.13d-1(b)(1)(ii)(G).  </FONT></TD>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>[_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>A
savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12
U.S.C. 1813);  </FONT></TD>
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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>[_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>A
church plan that is excluded from the definition of an investment company under section
3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);  </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>[_] </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Group,
in accordance with section 240.13d-1(b)(1)(ii)(J).  </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 4.</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Ownership</U> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<I><B><U>Keeley
Asset Management Corp.</U></B></I> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(a) </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Amount
Beneficially Owned:&nbsp;&nbsp;<B>755,000*</B> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(b) </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Percent
of Class:&nbsp;&nbsp;<B>6.3%</B> </FONT></TD>
</TR>
</TABLE>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(c) </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Number
of shares as to which such person has:  </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(i) </FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>sole
power to vote or to direct the vote:&nbsp;&nbsp;<B>-0-</B> </FONT></TD>
</TR>
</TABLE>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(ii) </FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>shared
power to vote or to direct the vote:&nbsp;&nbsp;<B>755,000</B> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(iii) </FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>sole
power to dispose or to direct the disposition of:&nbsp;&nbsp;<B>-0-</B> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(iv)</FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>shared
power to dispose or to direct the disposition of:&nbsp;&nbsp;<B>755,000</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>*  </FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>Keeley
Asset Management  Corp. and Keeley Small Cap Value Fund, Inc. share beneficial  ownership
over the same 755,000 shares. </FONT></TD>
</TR>
</TABLE>
<BR>

<BR><BR><BR><BR>


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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Page 5 of 8 Pages </FONT></P>





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<BR>

<TABLE WIDTH="760" CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER">
<TR VALIGN=TOP>
<TD WIDTH="100%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 </FONT><HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
<TR VALIGN=TOP>
<TD WIDTH=100%>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>CUSIP
No. 63886Q109</B> </FONT> <HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
</TABLE>
<BR>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<I><B><U>Keeley
Small Cap Value Fund, Inc.</U></B></I> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(a) </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Amount
Beneficially Owned:&nbsp;&nbsp;<B>755,000</B>*  </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(b) </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Percent
of Class:&nbsp;&nbsp;<B>6.3%</B> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(c) </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Number
of shares as to which such person has:  </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(i) </FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>sole
power to vote or to direct the vote:&nbsp;&nbsp;<B>-0-</B> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(ii) </FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>shared
power to vote or to direct the vote:&nbsp;&nbsp;<B>755,000</B> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(iii) </FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>sole
power to dispose or to direct the disposition of:&nbsp;&nbsp;<B>-0-</B> </FONT></TD>
</TR>
</TABLE>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=15%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(iv) </FONT></TD>
<TD WIDTH=80%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>shared
power to dispose or to direct the disposition of:&nbsp;&nbsp;<B>755,000</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 5.</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Ownership
of Five Percent or Less of a Class.</U></FONT></TD>
</TR>
</TABLE>
<BR>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>N/A</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 6.</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Ownership
of More than Five Percent on Behalf of Another Person.</U></FONT></TD>
</TR>
</TABLE>
<BR>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>N/A</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 7.</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Identification
and Classification of the Subsidiary Which Acquired the Security Being Reported on By the
Parent Holding Company.</U></FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>N/A</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 8.</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Identification
and Classification of Members of the Group.</U></FONT></TD>
</TR>
</TABLE>
<BR>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>N/A</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 9.</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Notice
of Dissolution of Group.</U></FONT></TD>
</TR>
</TABLE>
<BR>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<B>N/A</B> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>*  </FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=1>Keeley
Asset  Management  Corp. and Keeley Small Cap Value Fund,  Inc. share  beneficial
 ownership over the same  755,000 shares. </FONT></TD>
</TR>
</TABLE>
<BR>


<BR><BR><BR><BR>

<!-- MARKER FORMAT-SHEET="Page Number Center" FSL="Project" -->
<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Page 6 of 8 Pages </FONT></P>




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<BR>

<TABLE WIDTH="760" CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER">
<TR VALIGN=TOP>
<TD WIDTH="100%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 </FONT><HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
<TR VALIGN=TOP>
<TD WIDTH=100%>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>CUSIP
No. 63886Q109</B> </FONT> <HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
</TABLE>
<BR>


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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Item 10.</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Certification.</U></FONT></TD>
</TR>
</TABLE>
<BR>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;By
signing below I certify that, to the best of my knowledge and belief, the securities
referred to above were acquired and are held in the ordinary course of business and were
not acquired and are not held for the purpose of or with the effect of changing or
influencing the control of the issuer of the securities and were not acquired and are not
held in connection with or as a participant in any transaction having that purpose or
effect. </FONT></P>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%>&nbsp;</TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
<U>Exhibits.</U> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>1. </FONT></TD>
<TD WIDTH=85%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Agreement
to file Schedule 13G jointly.  </FONT></TD>
</TR>
</TABLE>
<BR>

<!-- MARKER FORMAT-SHEET="Head Major Center Bold-TNR" FSL="Project" -->
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SIGNATURE </FONT></H1>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;After
reasonable inquiry and to the best of my knowledge and belief, I certify that the
information set forth in this statement is true, complete and correct. </FONT></P>

<!-- MARKER FORMAT-SHEET="Head Left-TNR" FSL="Default" -->
<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Date: February 1, 2007 </FONT></P>


<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<TR VALIGN=Bottom>
     <TD WIDTH=50% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD WIDTH=50% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>KEELEY ASSET MANAGEMENT CORP.</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ John L. Keeley, Jr.</U></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>John L. Keeley, Jr., President</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>KEELEY SMALL CAP VALUE FUND, INC.</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ John L. Keeley, Jr.</U></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>John L. Keeley, Jr., President</FONT></TD></TR>
</TABLE>


<BR><BR><BR><BR>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Page 7 of 8 Pages </FONT></P>


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<BR>

<TABLE WIDTH="760" CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER">
<TR VALIGN=TOP>
<TD WIDTH="100%"><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 </FONT><HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
<TR VALIGN=TOP>
<TD WIDTH=100%>
<FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>CUSIP
No. 63886Q109</B> </FONT> <HR ALIGN=LEFT WIDTH=40% SIZE=1 NOSHADE></TD>
</TR>
</TABLE>
<BR>


<!-- MARKER FORMAT-SHEET="Head Major Center Bold-TNR" FSL="Default" -->
<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>EXHIBIT 1</U> </FONT></H1>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AGREEMENT
 dated as of February 1, 2007 by and among Keeley Asset  Management  Corp.,  an Illinois
 corporation,  and Keeley Small Cap Value Fund, Inc., a Maryland corporation. </FONT></P>


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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS,
in accordance with Rule 13d-1(k) of the Securities Exchange Act of 1934 (the
&#147;Act&#148;), only one such statement need be filed whenever two or more persons are
required to file a statement pursuant to Section 13(d) of the Act with respect to the same
securities, provided that said persons agree in writing that such statement is filed on
behalf of each of them. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NOW,
THEREFORE, in consideration of the premises and mutual agreements herein contained, the
parties hereto agree as follows: </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Keeley
Asset Management Corp. and Keeley Small Cap Value Fund, Inc. hereby agree, in accordance
with Rule 13d-1(k) under the Act, to file one Statement on Schedule 13G relating to their
ownership of the Common Stock of Natural Gas Services Group, Inc., and hereby further
agree that said Statement shall be filed on behalf of Keeley Asset Management Corp. and
Keeley Small Cap Value Fund, Inc. Nothing herein shall be deemed to be an admission that
the parties hereto, or any of them, are members of a &#147;group&#148; (within the meaning
of Section 13(d) of the Act and the rules promulgated thereunder) with respect to any
securities of Natural Gas Services Group, Inc. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IN
WITNESS WHEREOF, the parties have executed this agreement as of the date first written
above. </FONT></P>

<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<TR VALIGN=Bottom>
     <TD WIDTH=50% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD WIDTH=50% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>KEELEY ASSET MANAGEMENT CORP.</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ John L. Keeley, Jr.</U></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>John L. Keeley, Jr., President</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>KEELEY SMALL CAP VALUE FUND, INC.</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ John L. Keeley, Jr.</U></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>John L. Keeley, Jr., President</FONT></TD></TR>
</TABLE>

<BR><BR><BR><BR>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Page 8 of 8 Pages </FONT></P>

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