MONTRONE PAUL M
SC 13D/A, EX-99.1, 2003-12-08
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                                                                       Exhibit 1

                             JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1)(iii) promulgated under the Securities Exchange Act
of 1934, as amended, each of the undersigned agrees that the Statement on
Schedule 13D, to which this exhibit is attached, is filed on its behalf.

Dated: March 9, 2000


                                      /s/ Paul M. Montrone
                                     --------------------------------------
                                     Paul M. Montrone

                                     PMM GK INVESTMENT LLC


                                      /s/ Paul M. Montrone
                                     --------------------------------------
                                     By:  Paul M. Montrone, as Manager

                                      /s/ Sandra G. Montrone
                                     --------------------------------------
                                     Sandra G. Montrone

                                      /s/ Paul M. Meister
                                     --------------------------------------
                                     Paul M. Meister











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