73074368
Jan 15, 1976
Aug 7, 1979
SOUND RECORDING, SOUND REPRODUCING, SOUND AMPLIFYING AND SOUND TRANSMITTING APPARATUS AND EQUIPMENT-NAMELY, RECORD PLAYERS, TAPE RECORDERS, INSTRUMENTATION TAPE RECORDERS FOR SCIENTIFIC ANALYSIS, MIXERS, AMPLIFIERS, LOUDSPEAKERS, MICROPHONES, HEADPHONES, AND PARTS THEREOF AND FITTINGS THEREFOR
Electrical and Scientific Apparatus