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PD12M

Close up of a glass tube on a white surface

The image shows a close up of a glass tube on a white surface.

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The image shows a close up of a glass tube on a white surface. It appears to be a vacuum tube, with a cylindrical shape and a metal base. The top of the tube is transparent, allowing us to see the inner workings of the vacuum tube.

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

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