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MissPhiladelphia

It seem like there are information missing on the question posted. Let me answer this question with all I know. So here is what I believe the answer is, handle.

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Diatonic254

Belts, gears, and pulleys require a guarding device.  

Guarding machines act as a safety feature and consist of a shield covering dangerous areas of the machine to prevent contact with the body parts from chips or sparks from exiting the machine. Belts, gears, and pulleys can cause accidents so they require to be guarded at all times