1
Leonard J Genest, Vache B Madenlian: Combination changing system and method. Chromalloy Electronics Corporation, Nilsson Robbins Dalgarn Berliner Carson & Wurst, July 15, 1980: US04213118 (44 worldwide citation)

A combination changing system and method for controlling access to a locked area and updating a lock combination or memory includes encoded key cards and storing lock code combinations in a memory. Each lock may be opened by a properly encoded key card. The lock code combination is automatically cha ...


2
Leonard J Genest, Vache B Madenlian: Security system. J S Lock Company, Uniqey, Fitch Even Tabin Flannery & Welsh, August 11, 1981: US04283710 (40 worldwide citation)

A security system for controlling access to a locked area and updating a lock code combination memory. A central console generates lock code combinations, encodes key cards, and stores the lock code combinations. Correspondence between an authorization code combination inputted into the console, and ...