Fire detection products and systems, namely, electronic smoke sensors and detectors, electronic heat sensors, electronic flame sensors, gas sensors for measuring gas concentration, and gas detectors for detecting the presence of gas; fire detection products and systems, namely, fire alarm sounders in the nature of audio speakers for fire alarms; fire detection products and systems, namely, luminous safety beacons and notification appliances in the nature of electronic warning horns, electric alarm bells, flashing and steady safety strobes and loud speakers; fire alarm electric control panels; fire alarm network kits comprised primarily of fire alarms and also including computers and electric cables; fire alarm accessories, namely, electronic fire alarm loud speakers; computer interface boards for use with fire alarm systems; fireman's telephones, intercom and voice evacuation systems in the nature of communication hubs primarily comprised of intercoms, audio speakers and microphones; and metal and non-metal clamps, metal and non-metal mounting brackets for intercoms, audio speakers and microphones, electrical switches, computer mounts and electrical outlet adapter plates, all sold as integral component parts of the aforementioned telephones and intercom and voice evacuation systems in the nature of communication hubs primarily comprised of intercoms, audio speakers and microphones