<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>e603254_ex99-1.txt
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>

                                  EXHIBIT 99.1

                     AGREEMENT REGARDING JOINT FILING UNDER
                     UNDER RULE 13D-1(K) OF THE EXCHANGE ACT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as
amended, each of the undersigned agrees to the filing on behalf of each of a
Statement on Schedule 13G, and all amendments thereto, with respect to the
shares of Common Stock, par value $.10 per share of GRAHAM CORPORATION. .

Date: February 12, 2008

                                                      /s/ James H. Simons
                                                --------------------------------
                                                        James H. Simons


                                                Renaissance Technologies LLC

                                                By: /s/ Mark Silber
                                                    ----------------------------
                                                    Mark Silber
                                                    Executive Vice President


                               Page 8 of 8 Pages
</TEXT>
</DOCUMENT>
