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current | 11:01, 3 May 2021 | 677 × 694 (127 KB) | Materialscientist | FFT | |
06:01, 8 March 2010 | 677 × 694 (66 KB) | Chetvorno | {{Information |Description={{en|Silicon point-contact crystal detector from 1909. A variant of the Wikipedia:cat's whisker detector, this was used in early Wikipedia:crystal radio receivers during the first few decades of radio. The brass cont |
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