| Knuckle crane (DHA 850N)Boom System;1)The booms are composed of 1st, 2nd, 3rd & 4th stage boom.2)The material of boom is high tensile steel.3)The 1st stage boom is fixed to the column and driven by 1st stage cylinder. The articulated angle is 43.2 75.4)The 2nd stage boom is fixed to the 1st stage boom and bended by the jib cylinder. The articulated angle is 117. 5)The 3rd & 4th stage boom are extended by the telescopic cylinder in the 2nd stage boom and its extending length is 3,000 (mm).Grab; 1)Attaching at the end of the 4th stage boom, grab can be used.2)The grab keeps its horizontality by its dead weight even though the boom angle is changed.3)Detachment of the grab is easily can be done by locking pin at the side of the boom | 
