9 SEMICONDUCTOR EQUIPMENT, NAMELY, DIODES, TRANSISTORS, THYRISTORS, SILICON CONTROLLED RECTIFIERS; ELECTRICAL POWER SUPPLY EQUIPMENT, NAMELY RECTIFIERS, CONVERTERS, INVERTERS AND SWITCHING REGULATORS; ELECTRIC ROTARY SOLENOIDS, ELECTRIC TUBULAR SOLENOIDS AND PHOTOSENSITIVE DRUMS OF THE KIND USED IN ELECTROSTATIC COPYING MACHINES