Amplifiers; preamplifiers; cables for signal transmission; electromagnet coils; transformers; acoustic conduits; choking coils [impedance]; electric cables; electrical condensers [capacitors]; electric converters; sound transmission devices; anti-interference devices (electricity); audiovisual apparatus and installations; electric record players; tone arms for record players; record player needles; speed regulators for record players; compact disc players; DVD players; MP3 players; earphones; electronic tubes and their accessories; thermionic tubes; amplifying lamps; software (recorded programs); recorded computer programs; electric resistances; audiovisual players; holders for electric coils; compact disks (audio-video); integrated circuits; semiconductors; electric conductors; acoustic couplers; modems; connectors (electricity); remote control apparatus; electric installations for the remote control of industrial operations; voltage surge protectors; receivers (audio and video); cash registers; switchboxes.