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A single purchase crab machine uses one set of pulleys and a single line of action to lift heavy loads, making it simpler and generally more compact. In contrast, a double purchase crab machine employs two sets of pulleys, allowing for a greater mechanical advantage and the ability to lift heavier loads with less effort. This results in a more complex design but increases lifting efficiency and reduces the required motor power. Consequently, double purchase machines are often used in applications where heavy lifting is frequently required.

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