75111422
May 29, 1996
Jan 11, 2000
access control systems, comprising vandal resistant housings, speakers, microphones, memories for storing telephone numbers and corresponding code numbers, electric luminescent display panels and liquid crystal display panels, keypads, autodialers, and gate/lock control circuitry, for establishing communication between persons in a secured location and persons desiring to enter the secured location through a locked gate or door
Electrical and Scientific Apparatus