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 equipments; radio and television transmitting and receiving sets including car radio receiving sets, monitor television receiving sets and projection television equipments; 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; video discs; electric phonograph; record players; phonograph records; audio timers; pickups, tone arms; loudspeakers, loudspeaker systems; headphones; earphones; microphones; microphone mixers; electric switches; antennas; electron guns; public address apparatus; transceivers; interphones; dry batteries; AC power adaptors; radio and television tuners; sound amplifiers; stereo receivers (tuner-amplifier combination); audio tape, cassette and cartridge recorders and players with or without radio receiving sets and other combinations of above-mentioned goods; parts and fittings included in this class for use with the aforesaid goods.