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Close up of a glass tube on a white surface

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, which appears to be a vacuum tube.

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The image shows a close up of a glass tube on a white surface, which appears to be a vacuum tube. It has a cylindrical shape with a metal ring around the top, and a few metal rods protruding from the sides. The tube is transparent, allowing us to see the inner workings of the tube.

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

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