73116190
Feb 17, 1977
May 8, 1979
ELECTRONIC SOUND TRANSDUCERS FOR PICKING UP THE SOUND OF A GUITAR IN A SOUND AMPLIFICATION SYSTEM; ELECTRONIC ACOUSTICAL SOUND PICKUPS FOR PICKING UP THE SOUND OF A GUITAR IN A SOUND AMPLIFICATION SYSTEM, POTENTIOMETERS FOR USE IN GUITAR SOUND AMPLIFICATION SYSTEMS; SWITCHES FOR USE IN GUITAR SOUND AMPLIFICATION SYSTEMS
Electrical and Scientific Apparatus