... , boom, guider block, trolley, elevator, extend, column rotator, trolley driver, etc. LH3550 manipulator (Inner and outer circumferential)1. ... or MZ-1000 2.Structure and featuresThe column & boom is composed by column, boom, guider block, trolley, elevator, extend, ... trolley driver, etc.The column, boom, guider block and trolley are welded and strength released. There is protective lumen inside the ...