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

'access':1 'autodial':26 'circuitri':29 'code':14 'communic':36 'compris':4 'control':2,28 'correspond':13 'crystal':22 'desir':45 'display':18,23 'door':56 'electr':16 'enter':47 'establish':35 'gate':54 'gate/lock':27 'hous':33 'keypad':25 'liquid':21 'locat':42,50 'lock':53 'luminesc':17 'memori':7 'microphon':6 'number':11,15 'panel':19,24 'person':38,44 'resist':32 'secur':41,49 'speaker':5 'store':9 'system':3 'telephon':10 'vandal':31

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