Commercial and emergency signs, namely, luminous, mechanical, electronic and electric signs; signaling devices, namely, rotating lights, signal sirens; alarms, namely, alarm central units featuring computer generated sound amplification alert messages not for use with vehicles; sensing devices, namely, fire detectors, explosives detectors, chemical detectors for detecting and analyzing chemical containments and toxic substances present in the air, in liquids, in gases, in vapors, on surfaces, and in other environments, weather detectors, namely, weather stations for monitoring barometric pressure, temperature, humidity, rainfall, and wind speed and direction, electronic sensors for measuring air quality; apparatus for transmission of sound or images, namely, radio transmitters, digital cameras, video cameras, cellular telephones, satellite transmitters, wireless radio transmitters, local area networks, amplifiers, audio speakers, microphones; computer network apparatus, namely, computer hardware, computer network hubs, switches and routers, wireless cellular telephone apparatus and routers, satellite network hardware, namely, satellite aerials, processors, receivers and transmitters; telecommunications transmitters and receivers