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Black and white drawing of a pair of cylinders

PD12M

Black and white drawing of a pair of cylinders

The image shows a black and white drawing of a pair of cylinders, which appear to be a radiotelegraph.

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The image shows a black and white drawing of a pair of cylinders, which appear to be a radiotelegraph. The cylinders are connected to each other by a series of wires, and the drawing is accompanied by text that provides further information about the device.

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

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