EXHIBIT I Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required on Amendment No. 3 to Schedule 13G need be filed with respect to ownership by...

                                    EXHIBIT I

         Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement  containing the information
required  on  Amendment  No. 3 to  Schedule  13G need be filed  with  respect to
ownership  by  each  of the  undersigned  of  shares  of  Common  Stock  of Unit
Instruments, Inc.

         This Agreement may be executed in any number of  counterparts,  each of
which shall be deemed an original.


Dated:  February __, 1996
                                        ---------------------------------------
                                        Xxxxx X. Xxxxxxxx


                                        ---------------------------------------
                                        Xxxxxxx X. Xxxxxxxx


                                        J & L XXXXXXXX PARTNERSHIP

                                       By:
                                           ------------------------------------
                                           Xxxxx X. Xxxxxxxx, General Partner


                                       By:
                                           ------------------------------------
                                           Xxxxxxx X. Xxxxxxxx, General Partner


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