electric wire rope hoists

double girder overhead travelling craneHumans use hoisting machinery has several one thousand years of history, ancient Egypt and the Roman empire with original crane, built huge walls. But when the crane is fixed legs more. After entering the industrial age, movable mechanical crane arises at the historic moment. After hundreds of years of develop...ment, the mobile crane has been derived ground crane truck crane, crawler crane, and etc., large branch. This is drawn according to the description of the ancient Roman engineer Vitruvius block and tackle, crane with two fixed pulley and a movable pulley. There are ancient books claimed this crane was invented by the third century BC by Archimedes. electric wire rope hoists，This is drawn according to the description of the ancient Roman engineer Vitruvius block and tackle, crane with two fixed pulley and a movable pulley. There are ancient books claimed this crane was invented by the third century BC by Archimedes.  Auto Crane, Truck Crane,) in the early twentieth century originated in Europe. Its use truck chassis,