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Summary
DescriptionEB1911 Perpetual motion Fig. 4.png
English: Illustration from the 1911 Encyclopædia Britannica, article Perpetual Motion.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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