File:Radiola 24 Portable Super-Heterodyne, Radio Corporation of America - New England Wireless & Steam Museum - East Greenwich, RI - DSC06656.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 (33422610296).jpg - Wikimedia Commons