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File:Vintage Ultradyne Super-Heterodyne Kit Radio By Phenix Radio Corporation Of New York, AM Band, 10 Vacuum Tubes, Made In USA, Circa 1924 - 1925 (33422610296).jpg - Wikimedia Commons
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File:Vintage Ultradyne Super-Heterodyne Kit Radio By Phenix Radio Corporation Of New York, AM Band, 10 Vacuum Tubes, Made In USA, Circa 1924 - 1925 (33079720290).jpg - Wikimedia Commons
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