73213617
Apr 30, 1979
Jul 7, 1981
Security Alarm Systems Comprising One or More of the Following: Microwave, Ultrasonic and Photo-Electric Movement Detectors; Audio Detectors; Window and Door Alarms; Fire and Smoke Alarms; Thermal Detectors; Refrigeration Monitors; Camera Monitors; Closed Circuit Television; Video Tape Recorders; Sprinkler Alarm; Transmitters; Access Controls; and Monitoring Stations
Electrical and Scientific Apparatus