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LEONARDO: BALL-BEARINGS. /nDrawing by Leonardo da Vinci, c1495, of roller- and ball-bearings sustaining a vertical axle, an attempt to solve problems of friction in machinery Stock Photo - Alamy
Researchers Use Expanse to Explore Causes of Friction - Access
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MOHAI exhibit lets you test some of Leonardo da Vinci's inventions | The Seattle Times
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Inventions — Discovering da Vinci:
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