Telephone sets, interphones and other telephone apparatus; facsimile transmission apparatus, picture transmission apparatus and other wired communication apparatus; voice frequency transmission apparatus, carrier frequency repeaters and other carrier apparatus; radio transmitting and receiving sets, television transmitting and receiving sets, and other broadcasting apparatus; fixed single channel communication apparatus, fixed multi-channel communication apparatus, vehicular communication apparatus, marine communication apparatus, aeronautical communication apparatus, portable communication apparatus and other wireless communication apparatus; direction finders, radar apparatus and other applied radio apparatus; remote control and telemetering apparatus; sound recording apparatus, electric phonographs, record players, tape recorders, sound broadcasting apparatus, video tape recorders, compact disc players, video disc players, video cameras, audio and/or video playback apparatus, and other voice and/or video frequency apparatus