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Interconnected Communication Systems, Intercoms, And Interphones
(AREA)
Abstract
Dispositivo de llamada para puertas que está constituido esencialmente por un cuadro en el que se encuentran un altavoz y un micrófono que se hallan conectados mediante circuitos correspondientes con dispositivos telefónicos complementarios situados en cada una de las viviendas estando estos circuitos conectados con sendos interruptores selectores dispuestos en la propia placa y que al mismo tiempo actúan sobre los correspondientes dispositivos de llamada.
ES102439U1963-10-311963-10-31Dispositivo de llamada para puertas
ExpiredES102439Y
(es)
a CIRCUIT ARRANGEMENT FORTHE DETERMINATION OFTHE SERVICE CLASSIFICATION OF SUBSCRIBER STATIONS IN ELECTRONICALLY CONTROLLED TELEPHONE EXTENSION INSTALLATIONS