Surveillance cameras; spy cameras; explosive detection cameras; underwater cameras; industrial inspection cameras; gun-mounted cameras and recorders for firearms; optical sights cameras for firearms for the purpose of shooting around corners; sighting mirrors for guns and rifles; wearable and portable displays for surveillance cameras; gun-mounted cameras; robots; mobile cameras and fixed wireless cameras including head mounted displays; batteries for lighting; video cameras; protective helmets; detectors; nuclear; chemical and biological agents detectors; motion detectors; thermal radiation detectors; infrared radiation detectors; visible light detectors; vibration detectors; magnetic field detectors; millimeter wave detectors; radio wave detectors; sonar detectors; radar detectors; metal detectors for industrial or military purposes; filters for respiratory masks; photographic cameras; thermal cameras; infrared cameras; sonar instruments; radars; night vision equipment; laser gating observation systems; telescopes; binoculars; microscopes; telescopic sights for firearms; lasers not for medical purposes; electrical flashlights; electrical safety lights; electrical torches; protective masks; sighting telescopes for firearms; workmen's protective face-shields; visible light beacons; infrared light beacons; radio frequency beacons; mechanical signs; wireless radio transmitters for audio and video; communications radio links; telemetry systems; covert video and audio transmitters; analogue audio and video transmitters; digital audio and video transmitters; analogue bidirectional radios; digital bidirectional radios