File:Crystal radio advertisement.png
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Size of this preview: 800 × 483 pixels. Other resolutions: 320 × 193 pixels | 640 × 386 pixels | 881 × 532 pixels.
Original file (881 × 532 pixels, file size: 274 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:22, 2 May 2021 | 881 × 532 (274 KB) | Materialscientist | FFT | |
19:50, 12 January 2014 | 881 × 532 (173 KB) | Chetvorno | A clearer, less grainy, higher quality version of image | ||
08:26, 25 November 2010 | 823 × 494 (91 KB) | Chetvorno | {{Information |Description= {{en|Photo of a family in the 1920s listening to a Wikipedia:crystal radio. From a 1922 advertisement for Freed-Eisemann radios in ''Radio World'' magazine. Crystal sets are not powerful enough to power loudspeakers, so |
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