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File:Vintage Zenith Royal 755LG Portable Transistor Radio, Chassis 8CT41Z2, AM Band, 8 Transistors, Made In USA, Circa 1960 (49040781402).jpg - Wikimedia Commons
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Vintage Zenith Deluxe ROYAL 755 LK All-transistor Radio Standard AM Broadcast | Transistor radio, Radio design, Transistors
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File:Vintage Zenith Royal 51 Transistor Radio, Chassis 9NT41Z8, AM-FM Bands, 9 Transistors, Made In USA, Circa 1966 (49526676807).jpg - Wikimedia Commons
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