75111420
May 29, 1996
Mar 2, 1999
access control systems, comprising speakers, microphones, memories for storing telephone numbers and corresponding code numbers, electric luminescent display panels and liquid crystal display panels, keypads, autodialers, gate/lock control circuitry and vandal resistant housings, 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