Loudspeakers; headphones; earphones; microphones; intercoms; telephone sets; television receivers, television sets; radio receivers; portable radio communication machines and apparatus, namely, portable radios, portable listening devices, namely, mp3 players, portable digital memory players, portable digital audio files players, portable digital video files players, portable compact disc radio cassette players, and portable compact disc players; vehicular radio communication machines and apparatus, namely, car stereo receivers, audio cassette decks for automobiles, and compact disc players for automobiles; marine radio communication machines and apparatus; navigation apparatus for vehicles in the nature of on-board computers; portable navigation apparatus for vehicles in the nature of portable on-board navigation computers; public-address systems and instruments; optical audio disc players; optical audio disc recorders; juke boxes; karaoke machines; audio and video tape players; audio and video tape recorders; electric phonographs; sound recording and/or playing machines and apparatus, namely, component stereo sets, compact disc radio cassette players, and compact disc radio cassette recorders; audio frequency apparatus, namely, frequency converters, analogue to digital converters, and digital to analogue converters; video cameras and camcorders; video disc players; and video disc recorders