RONETTE
MICROPHONES AND MICROPHONE CARTRIDGES; SCREENED CABLES; IMPEDANCE MATCHING LINE TO GRID TRANSFORMERS; CABLES AND CONNECTION PLUGS; MICROPHONE STANDARDS; MICROPHONE SWITCHES; GRAMOPHONE PICKUP CARTRIDGES BASED ON PIEZOELECTRIC; AND GRAMOPHONE PICKUP CARTRIDGES, TONE ARMS, AND PARTS THEREOF, USED FOR CONVERTING MECHANICAL INTO ELECTRICAL VIBRATIONS
Expired · July 9, 1954 · 71669702 ·
