File:Audion.jpg
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Audion.jpg (167 × 387 pixels, file size: 25 KB, MIME type: image/jpeg)
De Forest Audion amplifier tube tin can
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:56, 20 January 2009 | 167 × 387 (25 KB) | Jvv (talk | contribs) | De Forest Audion amplifier tube tin can |
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