Often, a crane's boom is lengthened by a jib extension, which allows for higher lifting and more versatile movement. A crane boom is typically either held in place by a tower that stems from a permanent base or securely fixed on a mobile vehicle, such as commercial trucks or tread crawlers. Cranes are large industrial machines that allow for various objects and materials to be vertically lifted and lowered, and moved horizontally, through the use of hoist cables and sheaves, which are attached to booms and operated by hydraulic systems.
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