9 electronic and scientific apparatus; namely, diodes, light emitting diodes, electroluminescence device, transistors, phototransistors, selenium rectifiers, resistors, fuses, voltage regulators, electronic welders, electroplating apparatus for forming super hard coatings on the surface of a molding die, electric apparatus for removing molten solder from a soldered joint, ultrasonic abrasive apparatus, switches, relays and photorelays, photographic strobe lights, electric displays, operator display control panels and parts thereof for use in vehicles, in office equipment and in industrial equipment, light meters for measuring and fixing a shutter speed or diaphragm of cameras, liquid crystal displays for motor vehicles and for electronic equipment, electronic photoreceptors, noise suppressors, electrophotographic erasers, electronic power supplies for microcomputer equipment, for office automation equipment, for communication equipment and for numerically controlled equipment, railway signals, image scanners, liquid level meters