73658195
Apr 29, 1987
Oct 9, 1990
SEMICONDUCTOR APPARATUS, NAMELY DIODES, TRANSISTORS AND THYRISTORS (SILICON CONTROLLED RECTIFIERS); POWER SUPPLY APPARATUS, NAMELY RECTIFIERS, CONVERTERS, INVERTERS AND SWITCHING REGULATORS; ROTARY SOLENOIDS AND TUBULAR SOLENOIDS; PHOTOSENSITIVE SURFACE DRUM
Electrical and Scientific Apparatus