-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001223203-04-000015.txt : 20040312
<SEC-HEADER>0001223203-04-000015.hdr.sgml : 20040312
<ACCEPTANCE-DATETIME>20040312152336
ACCESSION NUMBER:		0001223203-04-000015
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20040309
FILED AS OF DATE:		20040312

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CANIZARES ROBERTO
		CENTRAL INDEX KEY:			0001215896

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15579
		FILM NUMBER:		04665948

	MAIL ADDRESS:	
		STREET 1:		PO BOX 426
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15230-0426

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MINE SAFETY APPLIANCES CO
		CENTRAL INDEX KEY:			0000066570
		STANDARD INDUSTRIAL CLASSIFICATION:	ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES [3842]
		IRS NUMBER:				250668780
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		121 GAMMA DR
		STREET 2:		OHARA TOWNSHIP
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15238
		BUSINESS PHONE:		4129673000

	MAIL ADDRESS:	
		STREET 1:		P O BOX 426
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15230
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>can11.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2004-03-09</periodOfReport>

    <dateOfOriginalSubmission>2004-03-11</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000066570</issuerCik>
        <issuerName>MINE SAFETY APPLIANCES CO</issuerName>
        <issuerTradingSymbol>MSA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001215896</rptOwnerCik>
            <rptOwnerName>CANIZARES ROBERTO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>121 GAMMA DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PITTSBURGH</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>15238</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, no par value</value>
            </securityTitle>
            <transactionDate>
                <value>2004-03-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2640</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8280.0000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The number of shares reported herein are after giving effect to a 3-for-1 common stock split payable January 28, 2004.</footnote>
    </footnotes>

    <remarks>This amendment is not restating and acquisition of shares but to gain access to the SEC site to report a Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>By: Douglas K. McClaine, Attorney in Fact</signatureName>
        <signatureDate>2004-03-12</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>3
<FILENAME>poarcanizares.txt
<TEXT>
POWER OF ATTORNEY

To Sign and File Reports under Section 16(a)
of the Securities Exchange Act of 1934,
under Rule 144 or any other Filings Required
Under the Federal Securities Laws
With Respect to Securities of Mine Safety Appliances Company


               KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby
constitutes and appoints Douglas K. McClaine or the General Counsel of Mine
Safety Appliances Company ("MSA"), Dennis L. Zeitler or the Vice
President-Finance of MSA and Nelson W. Winter, and each of them, his or her true
and lawful attorneys-in-fact and agents, with full power of substitution, for
the undersigned and in the undersigned's name, place and stead, to sign any and
all reports of the undersigned under Section 16(a) of the Securities Exchange
Act of 1934, under Rule 144 or any other filings required under the Federal
Securities Laws with respect to securities of MSA, and to file the same with the
Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all th at said attorneys-in-fact and agents or any of them, or
his, her or their substitute or substitutes, may lawfully do or cause to be done
by virtue hereof. The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming any of the undersigned's responsibilities to
comply with the Federal Securities Laws.

               This Power of Attorney shall remain in effect unless and until
notice of its revocation shall have been filed by the undersigned with the
Securities and Exchange Commission.

               IN WITNESS WHEREOF, the undersigned has executed and delivered
this Power of Attorney the date set forth below.

Date:  January 20, 2003


                                       SIGNATURE: /s/Roberto Canizares M.


                                        PRINT NAME:  Roberto Canizares M.


</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
