73535441
May 2, 1985
Mar 17, 1987
TELECOMMUNICATION HEADPHONES AND HEADSETS, AUDITORY TRAINING AND LISTENING HEADPHONES AND HEADSETS, DICTATION TRANSCRIBER HEADSETS, MINIATURE EARPHONES AND WIRING THEREFOR, ACOUSTICAL TRANSDUCERS, MINIATURE ELECTRICAL SWITCHES, CORDS AND PLUGS FOR AUDIO APPLICATIONS
Electrical and Scientific Apparatus