EXHIBIT 1

     This Exhibit 1 to Amendment No. 7 to Schedule 13D is filed pursuant to the requirements of Rule 13d-1(k)(1)(iii). The undersigned hereby agree that Amendment No. 7 to Schedule 13D, to which this Exhibit 1 is attached, is filed on behalf of each of the undersigned.

KEITHLEY INVESTMENT CO. LIMITED PARTNERSHIP, an Ohio limited partnership
By:	/s/ Joseph P. Keithley
	Joseph P. Keithley, its sole general partner
	/s/ Joseph P. Keithley
	Joseph P. Keithley

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