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The Giza Pyramids were constructed using step-walking wooden four-lobe pinion-pulleys with a mechanical advantage of 2.8 (MA=2.8)

This ancient pulley was unknown to the modern world until 27 August 2006.

The design and operation of this pulley is nothing like any pulley known in the modern world.

Google four lobe pinion pulley.

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13y ago

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