EXHIBIT 10.25 [LETTERHEAD OF HELLER FINANCIAL] June 1, 1995 Mr. Clifford Maxwell Assistant Treasurer Summagraphics Corporation 8500 Cameron Road Austin, TX 78754 Dear Cliff: This letter will confirm that Heller Financial, Inc. has extended the commitment to Summagraphics Corporation until August 31, 1995, subject to no material adverse change or no events of default. Sincerely, HELLER FINANCIAL, INC. /s/ Thomas J. Gordhamer Thomas J. Gordhamer Assistant Vice President cc: David West SIGNATURE PAGE FOR COMMITMENT EXTENSION May 26, 1995 Approval is recommended for an extension of the Summagraphics commitment until August 31, 1995 by: COMMERCIAL EQUIPMENT FINANCE - EASTERN REGION /s/ David West - --------------------------------------- E. David West, Assistant Vice President /s/ Dominick J. Masciantonio - ---------------------------------------- Dominick J. Masciantonio, Vice President /s/ La d M. Boulden - ------------------------------------------ La d M. Boulden, Senior Vice President