品川無線
JP 1192448, 目黒 弘、MORI IBARA, "INSIDE FORCE ELIMINATOR FOR PICKUP TONE ARM", published 1984-02-29
JP 54125002, KONAKAWA KAZUO, "PICKUP CARTRIDGE", published 1979-09-28
JP 55108904, KONAKAWA KAZUO, "VIBRATOR OF PICKUP CARTRIDGE", published 1980-08-21
JP 56068100, YOSHINO TAIJI, "MOVING COIL TYPE CARTRIDGE", published 1981-06-08
JP 56083199, YOSHINO TAIJI, "PICKUP CARTRIDGE", published 1981-07-07
JP 58075397, YOSHINO TAIJI, "STYLUS HOLDER OF STEREO PICKUP", published 1983-05-07
JP 58207792, TAYAMA AKIRA,朝倉 昭, "REPRODUCING SYSTEM OF MONAURAL RECORDING DISC", published 1983-12-03