U.S. federal trademark · Serial No. 73504281 · Reg. No. 1357779
A SECURITY SYSTEM FOR PERSONAL COMPUTERS CONSISTING OF AN EXPANSION CIRCUIT BOARD FOR THE PERSONAL COMPUTER, A KEY RECEPTACLE WITH CONNECTOR CABLE, A KEY DEVICE HAVING A SEMICONDUCTOR MEMORY IN WHICH ACCESS AND SECURITY CODES ARE ELECTRONICALLY RECORDED, A PRERECORDED COMPUTER PROGRAM AND A USER'S MANUAL SOLD AS A UNIT
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