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| View Original: | 1920s TRF radio manufactured by Signal.jpg (3088x2128) | |||
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| Keywords: 1920s TRF radio manufactured by Signal.jpg en 1920s TRF radio manufactured by Signal Electric MFG CO located in Menominee Mich Demonstrates early radio construction methods using breadboard own Armstrong1113149 Tuned radio frequency circuits Signal Electric Mfg Co breadboard radios Point-to-point construction Antique radios Radio in the 1920s | ||||
