ELECTRICAL APPLIANCES FOR CURRENT LIMITING, REGULATING, AND DISTRIBUTING PURPOSES-NAMELY, RHEOSTATS, CURRENT AND VOLTAGE REGULATORS, LIGHTNING AND HIGH-VOLTAGE PROTECTIVE DEVICES, BRUSHES AND CONTACT-MAKING DEVICES, AND PARTS THEREOF; ELECTRICAL APPLIANCES FOR HEAT-PRODUCING PURPOSES-NAMELY, DOMESTIC AND INDUSTRIAL ELECTRIC HEATERS AND DRIERS FOR HEATING AND DRYING AIR AND VARIOUS MATERIALS AND ARTICLES, AND ELECTRIC FURNACES, AND PARTS THEREOF; ELECTRICAL APPLIANCES FOR LIGHTING PURPOSES-NAMELY, INCANDESCENT AND ARC LAMPS AND PARTS THEREOF; ELECTRICAL APPLIANCES FOR ELECTRICAL CONVERTING PURPOSES-NAMELY, RECTIFIERS, BATTERIES, AND ACCUMULATORS, AND PARTS THEREOF; AND ESPECIALLY SUCH ELECTRICAL APPLIANCES AFORESAID AND PARTS THEREOF AS ARE PROVIDED WITH OR INCLUDE ELECTRICAL RESISTANCE ELEMENTS AND UNITS ESSENTIALLY AND SUBSTANTIALLY OF CARBON OR CARBON COMPOUNDS FOR USE FOR ELECTRICAL CURRENT LIMITING, REGULATING, DISTRIBUTING, HEATING, LIGHTING, AND CONVERTING PURPOSES