CRANE

A crane is a type of machine, generally equipped with a hoist, wire ropes or chains, and sheaves, that can be used both to lift and lower materials and to move them horizontally. It 
is mainly used for lifting heavy things and transporting them to other places. It uses one or 
more simple machines to create mechanical advantage and thus move loads beyond the 
the normal capability of a human. Cranes have commonly employed in the transport the industry for the loading and unloading of freight, in the construction industry for the movement of materials and in the manufacturing industry for the assembling of heavy equipment.