Optical lanterns; signal lanterns; warning lamps [beacons]; warning lights [flashing beacons]; flashing safety lights; flashing lights [luminous signals]; computer hardware for routing audio, video, and digital signals; naval signalling apparatus; safety signals [luminous]; luminous safety beacons; signalling lamps; beacon lights [safety equipment]; luminous beacons for safety or warning purposes; beacons, luminous; strobe lights [warning beacons]; alarm monitoring systems; apparatus for moni...