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Cranes: Bottom-Slewing Cranes

A crane is a piece of mechanical equipment that uses pulleys, winches, and ropes, cables or chains to lift an object. Bottom-slewing cranes are crane in which the boom and winch are mounted to a plate that is capable of rotating in order to move a load from one location to another. The slewing device can be mounted to the deck plate for a stationary crane or above the tracks on a mobile crane.