BT

ELECTRICAL APPARATUS-NAMELY, AUDIO AND RADIO-FREQUENCY GENERATORS, OSCILLATORS, DETECTORS, AMPLIFIERS, PREAMPLIFIER BOOSTERS, CONVERTERS, MIXER SEPARATORS, AND WEATHER-PROOF AND RADIATION-PROOF HOUSINGS FOR THE SAME; POWER-SUPPLY SYSTEMS; ELECTRICAL CONNECTORS, PLUGS, CABLES, TRANSMISSION LINES, LINE AND CABLE COUPLERS, OUTLETS, TAP-OFF CONNECTORS, MOUNTING PLATES, CONTROL BOXES, ISOLATION AND OUTLET NETWORKS, LINE SPLITTERS, IMPEDANCE-MATCHING DEVICES, FILTERS, ATTENUATORS, ATTENUATION EQUALIZERS, DUPLEXERS, DIRECTIONAL COUPLERS, WAVE TRAPS, FILTERS, AND RELAYS