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Fire Bottles: The 1928 RCA Radiola 18 and the Tuned Radio Frequency Design | https://frrl.wordpress.com
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File:Vintage RCA Radiola 18 AC AR-936 Wood Radio, TRF Without Reaction (Non Regenerative), AM Band Only, Requires External Speaker, 7 Tubes, Made In USA, Circa 1928 (25329692606).jpg - Wikimedia Commons
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Fire Bottles: The 1928 RCA Radiola 18 and the Tuned Radio Frequency Design | https://frrl.wordpress.com
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