Design and development of computer hardware and software

Apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; compact audio disc players, digital audio signal converters, compact audio disc changers, power supplies, cassette tape recorders, audio amplifiers, radio tuners, audio/video recievers, tape decks, tape decks with radio tuners, compact audio disc players with radio tuners, compact audio disc players with cassette tape players, electronic crossovers, dual amplifier balancers, loudspeakers, satellite speakers, discs, tapes, magnetic heads, headphones, microphones, electrical plugs, electrical cables, CD-ROM disc players, CD-ROM disc changers, clock radios, electronic computers, electronic computer drive systems, optical disc testers, remote control units

Cassette tape decks, remote control units, stereo headphones, head demagnetizers, microphones, power supplies, microphone mixers, remote sensors, audio components, compact disc players, stereo receivers, AM/FM stereo tuners, control amplifiers, power amplifiers, car cassette decks, car electronic crossovers, car passive crossovers, car bridging adapters, dual amp balancer, car speakers, car tuner cassette decks, car receiver cassette decks, car speaker components, mounting kits in this class for car cassette deck, optical media receiving and reproducing apparatus, digital audio tape recorders, electronic computers, drive for electronic computers, data processing apparatus for use with electric computers, optical disk testers