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Tóm tắt nội dung: Simple machines, such as the club and oar (examples of the lever), are prehistoric. More complex engines using human power, animal power, water power, wind power and even steam power date back to antiquity. Human power was focused by the use of simple engines, such as the capstan, windlass or treadmill, and with ropes, pulleys, and block and tackle arrangements; this power was transmitted usually with the forces multiplied and the speed reduced. These were used in cranes and aboard ships in Ancient...

Geometric Dimensioning and Tolerancing for Mechanical Design.pdf

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Geometric Dimensioning and Tolerancing for Mechanical Design pdf


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