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CERTAIN ELECTRICAL APPARATUSES AND FIXTURES CONSISTING OF CONDUIT OUTLET BOXES, COVERS FOR CONDUIT OUTLET BOXES MADE OF METAL OR INSULATING MATERIAL, SWITCH BOXES, SERVICE ENTRANCE BOXES, FUSE BOXES, LAMP RECEPTACLES, ROSETTES, PLUG RECEPTACLES AND PLUGS, FIXTURE SUPPORTS; ELECTRIC SWITCHES-NAMELY, KNIFE SWITCHES, RADIAL SWITCHES, TUMBLER SWITCHES, ENCLOSED SWITCHES AND ENCLOSED SAFETY SWITCHES; VAPORPROOF LIGHTING FIXTURES, HAND LAMPS, GAUGE LAMPS; HEADLIGHTS CONSISTING OF HEADLIGHTS FOR MINE LOCOMOTIVES, STREET CARS, AND AUTO BUSSES, BOTH ARC AND INCANDESCENT TYPES; LOCOMOTIVE-TENDER LAMPS, FLOOD LIGHTS, SEARCH LIGHTS, AIRPORT LIGHTS; [ TRAFFIC-SIGNAL EQUIPMENT, CONSISTING OF TRAFFIC-SIGNAL LIGHTS AND CONTROL EQUIPMENT-NAMELY, MANUAL SWITCHES, AUTOMATIC TIMERS, CONTROL BOARDS, AND CABINETS FOR EQUIPMENT; ] PANEL BOARD AND CABINETS, CONDUIT UNIONS, THREADLESS CONNECTORS, CABLE CONNECTORS, PIPE HANGERS, GROUNDING FITTINGS; AND MINE SIGNAL EQUIPMENT CONSISTING OF PULL SWITCHES, HOIST SIGNALS, BOTH BELL AND LIGHT TYPES, TERMINAL BOARDS, TELLTALE LAMPS, GONGS, AND BUZZERS