File:Electrodes Le de Forrest Triode tube 1906 Attribution.jpg
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Electrodes_Le_de_Forrest_Triode_tube_1906_Attribution.jpg (800 × 548 pixels, file size: 26 KB, MIME type: image/jpeg)
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current | 15:33, 2 March 2012 | 800 × 548 (26 KB) | Beichner (talk | contribs) |
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