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ELECTRIC FIRE ALARM SYSTEMS, BURGLAR ALARM SYSTEMS, NURSE CALL SYSTEMS FOR HOSPITAL USE, SPRINKLER SUPERVISORY SYSTEMS, WATCHMAN SERVICE SYSTEMS AND OTHER PLANT SUPERVISORY AND SECURITY SYSTEMS, CLOSED CIRCUIT AUDIO-COMMUNICATION AND SIGNALLING SYSTEMS, INDUSTRIAL PROCESS MONITORING AND CONTROL SYSTEMS, DATA LOGGING SYSTEMS, PARTS OF ALL SUCH SYSTEMS, CODE TRANSMITTERS AND RECEIVERS AND PARTS THEREOF