File:1922 Radio Enters the Home cover.jpg - Wikipedia
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History of Radio: In Springfield, MO: Hukriede, Malcolm, O'Day, Dan, Atkinson, Holly D: 9798387286766: Amazon.com: Books
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File:Vintage Radio Advertising - RCA Victor, "Go Overseas for only $14.95", Circa 1941 (9707444479).jpg - Wikimedia Commons
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