75180781
Oct 15, 1996
Mar 9, 1999
alarm and security systems, which also provide access control, for residential and commercial buildings comprised of a central controller computer which monitors electrical, electronic, and mechanical sensors, and fire and smoke detectors, automatic lighting, appliance and timing controls, open and closed circuit monitors, switches and sensors, electronic magnetic contacts, relays, transmitters, receivers and processors of electronic signals
Electrical and Scientific Apparatus