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PD12M

Close up of a metal object on a black surface

The image shows a close up of a metal object on a black surface, which appears to be a vacuum tube.

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The image shows a close up of a metal object on a black surface, which appears to be a vacuum tube. The object is cream and brown in color, and there is writing on it.

Credit: Wikimedia Commons
License: https://creativecommons.org/publicdomain/zero/1.0/

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