prerecorded audiocassettes featuring literary, educational and musical compositions; blank audiocassettes and audiocassette components, namely leaders, spring pads, liners, full shields, pins; prerecorded videocassettes featuring literary, educational, musical and entertainment compositions, namely motion pictures of drama and comedy; blank videocassettes and videocassette components, namely reel springs, VHS wiper tabs, beta wiper tabs, VHS guide sleeves, VHS guide pins, VHS reel locks; scientific apparatus, namely electronic scales, flowmeters, voltmeters, galvanometers, ammeters, ohmmeters and parts thereof; nautical apparatus, namely depth gauges, compasses, sonars, radars, navigational aids, namely buoys; direction finders and parts thereof; surveying apparatus, namely transits, levels, compasses, distance gauges and meters, and parts thereof; electrical apparatus, namely radio transmitters, radio receivers, television transmitters, television receivers, microwave transmitters, microwave receivers, repeaters, amplifiers, phase shifters, phase analyzers, telephones, audio cassette and video cassette recorders and players and parts thereof; light emitting diode displays; photographic apparatus, namely enlargers, cameras, projectors and parts thereof; cinematographic apparatus, namely motion-picture cameras and projectors, editors and parts thereof; optical apparatus, namely lenses, lens holders, optical benches, and parts thereof; weighing apparatus, namely electronic scales and parts thereof; signalling apparatus, namely fire, intrusion, toxic-substance and smoke alarms and parts thereof, * checking and supervision apparatus, * namely video cameras and monitors, infrared and ultraviolet monitors, heat sensors and parts thereof; lifesaving apparatus, namely respirators for other than artificial respiration and parts thereof; teaching apparatus, namely movie projectors, photographic projectors, slide projectors; learning machines, namely computers and parts thereof; coin or token operated apparatus, namely vending machines, dispensers and parts thereof; talking machines, namely audio tape recorders, audio tape players and parts thereof; cash registers; calculators; and fire-extinguishing apparatus, namely fire extinguishers and parts thereof