73822020
Aug 28, 1989
Dec 24, 1991
SECURITY MONITORING AND CONTROL SYSTEMS; NAMELY, SECURITY MONITORING DEVICES AND COMMAND CENTERS; EVENT PROGRAMMERS AND LOGGING DEVICES; ACCESS, LIGHTING, ENVIRONMENTAL, AND ALARM CONTROLS; INTRUSION SENSORS AND PASSWORD IDENTIFICATION DEVICES; STATUS MONITORS AND INDICATORS; SMOKE, HEAT, MOTION, AND ENVIRONMENTAL DETECTORS; REPORTING COMMUNICATORS AND INFORMATION RELAYS, AND COMBINATIONS OF THE PRECEDING
Electrical and Scientific Apparatus