Electrical apparatus and instruments relative to audio and video transmitting and receiving and recording and reproducing systems; namely, audiovisual teaching apparatus; automatic telephone answering and recording machines and remote control oscillators thereof; dictating machines; cable television equipment; radio and television transmitting and receiving sets including auto radio receiving sets and monitor television receiving sets; audio and video tape dubbing apparatus; video displays; video tape, cassette and disc recorders and players; magnetoelectric transducers; demagnetizers; unrecorded and prerecorded audio and video tapes and cassettes; phonograph records; video discs; electric phonographs; record players; motors for audio and video tape, cassette and disc recorders and players and for phonographs, pick-ups; tone arms; loudspeakers; speaker systems; headphones; earphones; Microphones, microphone mixers, antennas; electron guns; switches; public address apparatus; transceivers; interphone; dry batteris; AC power adapters; tuners; amplifiers; receivers (tuner-amplifier combinations); audio tape, cartridge and cassette recorders and players with or without radio receiving sets and other combinations of these goods; parts and fittings for all the aforesaid goods