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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/429653Illustration by an American engineer and inventor, Robert Fulton (1765-1815), of cock cavity and wheel details for Plunging…Save

Illustration by an American engineer and inventor, Robert Fulton (1765-1815), of cock cavity and wheel details for Plunging Boat for the United States government. Original from Library of Congress. Digitally enhanced by rawpixel.

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