[ Antennas; antenna boosters; electrical signal distribution devices, namely, audio signal distributors; earphones; wireless receivers; wireless transmitters; battery chargers for microphones; microphones; radio microphone systems comprising microphones, tuners and receivers; public address and sound system accessories and fittings, namely, microphone stands, speaker stands, microphone cables, speaker cables, electric connectors, mounting racks for loudspeakers, loudspeaker cabinets and installation brackets specially adapted for setting up public address systems; infrared communication systems comprised of infrared microphones, infrared wireless receivers, infrared wireless transmitters, and infrared wireless photoreceivers; infrared microphones; infrared wireless receivers; infrared wireless transmitters; infrared wireless photoreceivers; public address systems and instruments; amplifiers; mounting racks for telecommunication devices and apparatus; mounting racks for sound system devices and apparatus; mounting racks for closed circuit television system devices and apparatus; monitors for monitoring audio signal levels of audio equipment; electrical transformers for telecommunication apparatus; audio frequency transformers for public address systems; audio signal processors; audio mixers; cabinets for telecommunication devices and apparatus; cabinets for sound system devices and apparatus; cabinets for closed circuit television system devices and apparatus; storage container boxes exclusively for use in racks and cabinets for broadcasting machines and apparatus; blank panels exclusively for use in racks and cabinets for broadcasting machines and apparatus; ventilation panels exclusively for use in racks and cabinets for broadcasting machines and apparatus; sound reproduction apparatus; audio recording and playback devices; cassette players; compact disc players; tape recorders; radios; audio signal transmission and reception devices; programmable timers for use with public address systems and broadcasting machines and apparatus; control panels for public address systems; audio signal interfaces; audio signal controllers; audio signal converters; attenuators; diaphragms for loudspeakers; horns for loudspeakers; drivers for loudspeakers; megaphones; ] network audio transmission and reception devices; network audio devices, namely, audio speakers and audio amplifiers for use in transmitting and receiving audio signals via networks [ ; intercom exchange machines; intercom terminals; telephone apparatus; telephone transmitters and receivers; conference systems comprising telecommunication devices and apparatus, namely, microphones, transmitters, receivers, and amplifiers; electronic notice boards; emergency broadcasting equipment, namely, microphones, audio amplifiers, audio signal interfaces, control panels, and power supply units; closed circuit television systems comprised of security alarms, cameras, audio-video monitors, microphones, audio/video recorders, audio-video transmitters, audio-video receivers, and hardware and software for operating the aforementioned devices; video signal interface devices for closed circuit television systems; video signal transmission and reception devices; audio and video receivers; video signal receivers; video display switching devices; video signal compensation devices for closed circuit television systems; lenses for closed circuit television cameras; electric control panels for the operation of video equipment; controllers for video monitoring equipment in the nature of remote controllers for video monitoring apparatus; electronic controllers for video monitoring apparatus for control of systems comprised of security alarms, cameras, monitors, microphones, audio/video recorders, audio-video transmitters, audio-video receivers, and hardware and software for operating the aforementioned devices; electronic controllers for centralized control video monitoring apparatus; closed circuit television cameras; covers for closed circuit television cameras; synchronized video signal transmitting devices; electrical swivel mounts for use with closed circuit television cameras; hard disc drives; digital video recorders; housings for closed circuit television cameras; video monitors; electrical signal distribution devices, namely, video signal distributors; video signal converters; network video monitoring devices for closed circuit television system, namely, cameras, video recorders, video receivers, video transmitters, and software decoders; installation brackets especially adapted for telecommunication hardware; installation brackets especially adapted for sound system devices; installation brackets especially adapted for closed circuit television system devices; audio and video signal distribution devices; transmitters of electronic signals; receivers of electronic signals; sound transmitting apparatus; sound receiving apparatus; electric installations for the remote control of industrial operations; electro-dynamic apparatus for the remote control of signals, namely, remote controls for closed circuit television systems, public address systems, intercom systems, conference systems, and emergency broadcasting systems; electric plugs, outlets, jacks and connectors for use with audio and video signals; computer software for configuration and function enhancement of network video monitoring devices and network audio devices recorded on computer media; computer software for setting up and configuring local area networks recorded on computer media; computer software for setting up and configuring wide area networks recorded on computer media; downloadable computer software for configuration and function enhancement of network audio monitoring devices and network audio devices; downloadable computer software for setting up and configuring local area networks; downloadable computer software for setting up and configuring wide area networks; computer software for use in recording, amplifying, reproducing and transmitting sounds ]