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Movable Pulley: A pulley that rotates and translates in accordance to the movement of the pulley or belt. This is usually utilized in blocking and tackle systems, which I will make clear afterwards.
Roller: A standard pulley has a slot for a belt, chain or cable. A reel is a broader pulley commonly employed in cable techniques, making it possible for the cable to be wound all around a number of occasions the diameter of the reel.

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