FIRE PROTECTION EQUIPMENT-NAMELY, FIRE SENSING AND DETECTING DEVICES RESPONSIVE TO PRODUCTS OF COMBUSTION; FIRE CONTROL SYSTEMS COMPRISING ANNUNCIATOR PANELS, DETECTOR SWITCHES AND RELAYS FOR ACTUATING AN ALARM; ELECTROMECHANICAL DOOR HOLDER RELEASES AND/OR DOOR CLOSERS AND LATCHES; AND AUDIBLE AND SILENT ALARMS AND INDICATORS INCLUDING BELLS, BUZZERS, HORNS, LIGHTS AND SIRENS; AND FIRE CONTROL SYSTEMS COMPRISING ANNUNCIATOR PANELS, DETECTOR SWITCHES AND RELAYS FOR ACTUATING MECHANICAL, ELECTRICAL OR PNEUMATIC FIRE PROTECTION EQUIPMENT OF SPRINKLER SYSTEMS