Cranes

A crane is a tower or derrick that is equipped with cables and pulleys that are used to lift and lower material.  They are commonly used in the construction industry and in the manufacturing of heavy equipment. Cranes for construction are normally temporary structures, either fixed to the ground or mounted on a purpose built vehicle. 

They can either be controlled from an operator in a cab that travels along with the crane, by a push button pendant control station, or by radio type controls.  The crane operator is ultimately responsible for the safety of the crews and the crane.