How Gears Work - Different Types of Gears, their Functions ...
https://www.thomasnet.com/articles/machinery-tools-supplies/understanding-gears/
Gears and their mechanical characteristics are widely employed throughout industry to transmit motion and power in a variety of mechanical devices, such as clocks, instrumentation, and equipment, and to reduce or increase speed and torque in a variety of motorized devices, including automobiles, motorcycles, and machines.
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