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

'access':1 'autodial':29 'circuitri':33 'code':17 'communic':36 'compris':4 'control':2,32 'correspond':16 'crystal':25 'desir':45 'display':21,26 'door':56 'electr':19 'enter':47 'establish':35 'gate':54 'gate/lock':31 'hous':7 'keypad':28 'liquid':24 'locat':42,50 'lock':53 'luminesc':20 'memori':10 'microphon':9 'number':14,18 'panel':22,27 'person':38,44 'resist':6 'secur':41,49 'speaker':8 'store':12 'system':3 'telephon':13 'vandal':5

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