Substructures-for drilling rig DZ225/6-XD,DZ225/7.5-S,DZ315/7.5-XD,DZ315/9-S,DZ450/9-XD,DZ450/10.5-S,DZ675/12-S

Four kinds of substructures:box-on-box,integrate and one step risen,two-step raising &swing lift.

Substructures-for drilling rig

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