Fire alarms; fire extinguishing systems; heat detectors for use in fire safety; flame detectors; smoke detectors; smoke alarms; gas detectors; gas alarms; liquid level gauges, liquid level alarms, alarm central units; power supplies; electric relays; electronic signal repeater panels for alarm systems; manual call points, namely, manually activated emergency alarm stations for reporting fires and other emergencies and for activating fire suppression equipment; electronic timers; emergency war...