... provided bynational-level manufacturer. To adopt eddy current brake,four-speedwinding hoist.( 3 ) Slewing bearing : appointed ... SlewingBearing Factory .( 4 ) Slewing mechanism : equipped with four-speed winding motor and "Shengjian " brand, the quality ... safe ,auto wiper, air conditioner.( 9 ) Basic mast section : square strengthened steel, repeatedlyapplicable, convenient in tower crane displacement ...