Capsule microphones; hand microphones with directional characteristic; headphone-microphone combinations; headphones for microphones; microphone buttons; microphone mixers; microphones; microphones for record players; motion control booms for use with microphones; sound reproducing apparatus with microphone; tripods for microphones; playback devices for audio tapes; audio amplifiers; integrated audio amplifiers; control boxes for headphones; headphones for audio apparatus; headphones for microphones; plug adaptors for headphones; stereophonic apparatus incorporating headphones for personal use; two-way plugs for headphones