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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:00, 8 March 2010 | 1,089 × 592 (245 KB) | Chetvorno | {{Information |Description={{en|A ''Perikon'' crystal detector used in crystal radio receivers around the beginning of the 20th century, from a 1914 book on radio.}} |Source=Downloaded 2009-11-08 from [http://books.google.com/books?id=cBc9AAAAYAAJ& |
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