Earphones (other than hearing aids for the deaf); earphones for radios; earphones for recording apparatus; control boxes for headphones; covers for headphones; headphone amplifiers; headphone consoles; headphone-microphone combinations; headphones; headphones for audio apparatus; headphones for microphones; plug adaptors for headphones; stereo headphones; stereo headphones for personal entertainment use; stereophonic apparatus incorporating headphones for personal use; stereophonic headphones; two-way plugs for headphones; capsule microphones; electric leads for microphones; guitar microphones; hand microphones with directional characteristic; headphone-microphone combinations; headphones for microphones; microphone buttons; microphone mixers; microphone plugs; microphones; microphones for record players; motion control booms for use with microphones; sound reproducing apparatus with microphone; telephone handsets incorporating microphones; tripods for microphones; ultrasonic microphones; audio speakers; audio speakers for automobiles; audio speakers for home; car speaker components; car speakers; electric leads for speakers; monitor speakers; personal stereo speaker apparatus; public address speaker systems; signal processors for audio speakers; speaker switches; speakers (audio equipment); speakers for compact disc players; speakers for computers; speakers for record players; speakers for tape players; warning loud speaker apparatus for mounting on the roof of emergency services vehicles; aerial amplifiers; amplifier tuners; amplifiers; amplifiers being audio apparatus; amplifiers for transducers; amplifiers for use in cars for entertainment purposes; amplifiers for use with gramophones; audio amplifiers; control amplifiers; digital amplifiers; distribution amplifiers; dual amplifier balancers; electric amplifiers (current); electric amplifiers (signal); electric amplifiers (sound); electric cords for musical amplifiers; electric leads for amplifiers; electrical amplifiers; electrical amplifiers for driving servo motors; electrical amplifiers for sound signals; electrical amplifiers for use with musical instruments; electroacoustic amplifiers; electrodes with amplifiers; electrodes without amplifiers; electronic amplifiers; electronic switching amplifiers; guitar amplifiers; headphone amplifiers; image amplifiers; integrated audio amplifiers; keyboard amplifiers; masers (microwave amplifiers); optical amplifiers; power amplifiers for creating effects; power amplifiers for use in sound reproduction; power output amplifiers; power supply units for aerial amplifiers; pressure amplifiers; radar receivers with amplifiers; residual light image amplifiers; signal amplifiers; sound amplifiers; stereo amplifiers; stereophonic amplifiers; television signal amplifiers; transportable guitar amplifiers; voice amplifiers for detecting doorbells; voice amplifiers for detecting ringing mechanisms; voice amplifiers for detecting telephone rings