TELEVANT
								ELECTRONIC TRANSMITTING AND RECEIVING UNITS WHICH ARE COOPERATIVELY CONNECTED TO AN OPERATIONAL TELEPHONE LINE THEREBY PROVIDING A SYSTEM FOR AUTOMATICALLY RELAYING SIGNAL INFORMATION REGARDING ANY CHANGE FROM THE NORMAL SUCH AS BURGLARY, EQUIPMENT MALFUNCTION, FIRE, CHANGES IN TEMPERATURE, ETC
                                Expired  ·  August 29, 1972  ·  72434090  ·