audio and video receivers; video cameras, video cassette recorders; blank video cassettes; digital video disc drives; digital video recorders; electric and electronic video surveillance equipment; video recording apparatus, television and video converters; video capture cards; video circuit boards, video game discs; video game interactive control floor pads or mats; video graphics accelerators and controllers; video monitors; video multiplexes; video processors; video projectors; video phones; video screens; video transmission apparatus; electrical and electronic sensors for monitoring video and audio; optical transmitters; optical receivers; optical data links; optical transceivers; digital transmitters; electronic cable; electronic circuit boards; electric and electronic switches; electronic controls for motors; electronic control systems for machines; electronic motion sensitive switches; electronic semi-conductors; electronic testing equipment, namely, sound level meters and telecommunication line integrity testing apparatus; electronic timers; scientific apparatus, namely sensing and signaling devices for measurement and quality control of materials processing by laser; apparatus for testing gas, liquids and solids; metal compression testing machines; metal hardness testing machines; metal strength testing machines; plastic testing machines; probes for testing integrated circuits; testing apparatus for testing printed circuit boards; microprocessors; computers, computer programs for use in and with the operation and control of audio-visual and lighting equipment; electric light switches; lighting ballasts; lighting control panels; lighting devices for taking pictures; security and lighting systems primarily comprising movement sensors and electronic lighting control devices; wave reflectors for lighting apparatus; electrical and electronic controllers and remote controllers for audio-visual players and recorders; electrical controllers; video graphics controllers; sound controllers; projection screens