File:Armstrong regenerative radio 0452.jpg
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Armstrong_regenerative_radio_0452.jpg (606 × 480 pixels, file size: 29 KB, MIME type: image/jpeg)
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current | 17:52, 17 November 2008 | 606 × 480 (29 KB) | Leydoig (talk | contribs) | copyright held by Smithsonian |
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