Telephone sets; automatic telegraph apparatus; manual telegraph apparatus; facsimile machines; carrier-frequency repeaters; television receivers; television transmitters; radio receivers; radio transmitters; compact disc players; juke boxes; tape recorders; electric phonographs; record players; video cameras; videodisc players; video recorders; magnetic tape erasers; magnetic tape cleaners; magnetic head erasers; magnetic head cleaners; speakers; fuses for communication apparatus; change-over switches; distribution boards; pickups; headphones; microphones; blank record discs; Geiger counters; cyclotrons; magnetic object detectors; shielding cases for magnetic discs; seismic wave surveying machines; hydrophones; ultrasonic depth sounders; ultrasonic flaw detectors; ultrasonic sensors and sonars; electrostatic copying machines; electronic door closing system; computers; electronic microscopes; desktop computers; word processors; x-ray tubes, not for medical use; photo tubes; vacuum tubes; rectifier tubes; cathode ray tubes; discharge tubes; other electron tubes; digital still cameras; video cameras; liquid crystal displays; plasma displays; computer memory; core memory; drum memory; bubble memory; cathode ray tube display; magnetic cards; video projectors; semiconductors