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The first innovation to appear was the power take-off, offered after 1922. This device, a metal shaft turned by the rotation of the tractor motor, allowed implements to be driven directly by the tractor engine, as opposed to obtaining power from a wheel rolling along the ground. The power take-off quickly became a standard feature on all tractors, and implement makers began the process of re-designing their equipment to take advantage of this innovation.

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Q: How has the tractor changed over the years?
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