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LZ Single Beam Mechanical Clam Shell Grab Bucket Crane for Coal Powder Sands Handling I. LZ Single Beam Mechanical Clam Shell Grab Bucket Crane Brief introduction: Grab cranes are hoisting machinery with grapples. They are widely used in ports, docks, station freight yard, mines and so on.link:http://www.chinacranemanufacturer.com/overhead-crane/single-girder-overhead-crane/lz-single-beam-mechanical-clam-shell-grab.html