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ELECTRONIC COMMUNICATIONS, ALARM AND SECURITY SYSTEMS, COMPRISING CODED, RADIO-FREQUENCY TRANSMITTERS, RECEIVERS AND TRANSCEIVERS, AND ASSOCIATED WIRING AND FASTENING UNITS, FOR PRODUCING AND RECEIVING AUDIBLE AND INAUDIBLE ALARM AND/OR VOICE SIGNALS AND/OR VISUAL IMAGES, AND FOR ARMING AND DISARMING THE UNITS FROM REMOTE LOCATIONS; MOBILE, IN-PLANT, AND STATIONARY/FIXED TRANSMITTERS; RADAR DETECTORS