RADIO RECEIVERS; TUNERS; AMPLIFIERS; AUDIO (AND/OR) VIDEO TAPE RECORDERS; HEAD-PHONES; SPEAKERS; MICROPHONES; RECORD PLAYERS; AUDIO MIXERS; STYLUS; RACKS FOR RADIO RECEIVERS, TUNERS, AMPLIFIERS, TAPE RECORDERS OR RECORD PLAYERS; GRAPHIC EQUALIZERS; AUDIO TIMERS, REMOTE CONTROLLERS FOR RADIO RECEIVERS, TUNERS, AMPLIFIERS, TAPE RECORDERS OR RECORD PLAYERS; REMOTE POWER SWITCHES; ANTENNAS; HEAD SHELLS FOR MOUNTING PICKUP CARTRIDGES; CASSETTE AND ACCESSORY CASES; STANDS FOR SPEAKERS; CORDS AND CABLES FOR RADIO RECEIVERS, TUNERS, AMPLIFIERS, TAPE RECORDERS OR RECORD PLAYERS; DIGITAL AUDIO DISC PLAYERS; AUDIO DISCS, AUDIO TAPES; CASSETTE TAPES FOR TAPE RECORDERS; DIGITAL ENCODERS AND DECODERS; VIDEO DISC PLAYERS AND DISC DISCS; TELEVISION RECEIVERS; TAPE AND CASSETTE TAPES FOR VIDEO TAPE RECORDERS; VIDEO CAMERAS; VIDEO TAPE WINDERS; MEASURING INSTRUMENTS, NAMELY, OSCILLOSCOPES; RESISTANT ATTENUATORS; PATTERN GENERATORS; FREQUENCY COUNTERS; OSCILLATORS; RADIO-FREQUENCY SIGNAL GENERATORS; SWEEP GENERATORS; FUNCTION GENERATORS; VOLT METERS; WOW-FLUTTER METERS; FREQUENCY CHESKERS; PROBE SELECTORS FOR OSCILLOSCOPES; POWER METERS; DIP METERS; MULTI-METERS; REGULATED DIRECT-CURRENT POWER SUPPLIES; STEREO SIGNAL GENERATORS; AUDIO FREQUENCY GENERATORS; REMOTE CONTROLLERS FOR OSCILLOSCOPES; OSCILLATORS VOLT METERS; MEASURING INSTRUMENT PROBES FOR CHECKING ANALYSIS OF ELECTRICAL CIRCUIT; TONE BURST GENERATORS; SPEAKER TEST GENERATORS; AUDIO SEQUENCERS; DIGITAL MEMORY-SCOPES; LOGIC ANALYZERS; TRANSCEIVERS; COMMUNICATIONS RECEIVERS; VARIABLE FREQUENCY OSCILLATORS; ANTENNA TUNERS; FREQUENCY MOBILE CONTROLLERS; DIRECT-CURRENT POWER SUPLLIES; DIRECT-CURRENT CONVERTERS; OSCILLATORS, ELECTRIC TRANSCEIVER UNITS AND PARTS THEREFOR; FILTERS AND VOICE CONTROLS FOR TRANSCEIVERS; BATTERIES, BATTERY CHARGERS; AND CASES FOR TRANSCEIVERS; STANDS AND TONE UNITS FOR TRANSCEIVERS; VACUUM TUBES FOR AMPLIFICATION PURPOSES IN AUDIO OR COMMUNICATION EQUIPMENT; POWER SUPPLY CORDS; CONNECTORS; RADIO-FREQUENCY DUMMY LOADS FOR TESTING TRANSCEIVERS; RACKS AND STATION CONTROLS FOR TRANSCEIVERS AND COMMUNICATION RECEIVERS; RECEIVERS AND ANTENNA FOR SATELLITE COMMUNICATION; TELEGRAPHS; TELEMETERS; TELEPHONES; TELEPHONE TRANSMITTERS; TELEGRAPHIC TRANSMITTERS; TELEPHONE RECEIVERS; TELEPRINTERS; TELETYPEWRITERS AND ELECTRIC ALARM BELLS