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Wheel Profile

Wheel is human labor in handling things gradually found in practice. In primitive societies, human ancestors to gathering and hunting, at the beginning, get food are limited, easily could take to bring it back. So, someone came up with the idea, picking a few thick branches broken off the ground, with vine to connect the branches together, and then put the game in the top, grab the long branch in tow, this more than the shoulder back light. Also think of using a stick, end on his shoulder and the other on the ground, hanging the weights in the Middle stick pulled, this is better than hand handling effort. People stick to two side-by-side up, in the Middle a piece of cloth, hands holding two rod-end, dragged on the ground at the other end. Above all, is the first invention of a "light pry", it features with slippery Rod sliding on the ground.

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