File:Diode S Tube.png
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Diode_S_Tube.png (623 × 480 pixels, file size: 65 KB, MIME type: image/png)
used circa 1922
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:02, 11 February 2009 | 623 × 480 (65 KB) | K3hz (talk | contribs) | used circa 1922 |
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