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File:Vintage Regency TR-1 Transistor Radio, Serial Number 16599, AM Band, Ivory Cabinet, 4 Transistors, Made In USA, Circa 1954 (33172890345).jpg - Wikimedia Commons
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REGENCY TR-1 THE FIRST TRANSISTOR RADIO SM Service Manual download, schematics, eeprom, repair info for electronics experts
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Regency TR-1 - World's first transistor radio, with case, early example 1954 - collectornet.net - YouTube
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