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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