74009712
Dec 11, 1989
Apr 2, 1991
SECONDARY ALARM TRANSMISSION CELLULAR INTERFACES FOR PROVIDING AN INDEPENDENT AND STANDBY CELLULAR TRANSMISSION CAPABILITY TO THE TELEPHONE COMMUNICATION OUTPUT OF A MULTIPURPOSE SECURITY ALARM CONTROL PANEL FOR TELEPHONIC SIGNALLING OF PRESET CODES, IN RESPONSE TO SENSED ALARM CONDITIONS, TO A CENTRAL STATION BY AUTOMATIC DIALING OF ONE OR MORE PREPROGRAMMED NUMBERS
Electrical and Scientific Apparatus