Cranes

A crane is a lifting machine, it's any kind of a diverse group of machines that can lift and move heavy objects. Cranes range from hoists, elevators, and other devices intended for vertical lifting, and from conveyors, which continuously lift or carry bulk materials. Cranes have been widely used only since the introduction of steam engines, internal-combustion engines, and electric motors in the 19th century. Small truck cranes are mounted on heavy, modified trucks, they make up in mobility and ease of transport what they lack in hoisting capacity.

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