File:Crystal radio receiver from wireless era.png
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 10:15, 26 November 2009 | | 1,592 × 889 (350 KB) | commons>Chetvorno | {{Information |Description={{en|Wikipedia:Crystal radio receiver from the wireless era.}} |Source=Downloaded 2009-11-14 from Rupert Stanley (1914) ''Textbook on Wireless Telegraphy, Vol. 1'', Longmans Green & Co., New York, p.265, fig. 151 on Goo |
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