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Black and white drawing of two vacuum tubes

PD12M

Black and white drawing of two vacuum tubes

The image shows a black and white drawing of two vacuum tubes, each with a unique shape and size.

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The image shows a black and white drawing of two vacuum tubes, each with a unique shape and size. The tubes are connected to each other by a series of wires, and the text at the bottom of the image reads "Vacuum Tube".

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

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