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Image: Perpetual motion wheels Vinci

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Description: Perpetual motion wheels from a drawing of Leonardo da Vinci
Title: Perpetual motion wheels Vinci
Credit: Own work
Author: This illustration was made by Citron You must credit this : Citron / CC-BY-SA-3.0
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes

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