drilling rig,Drilling Rig,30,40,50,70,90DBS,drill rig,factory price,09new style,tech from USADec 21, 2012
... -feed device, a patent of Honghua , the WOB is controlled precisely. The rig operation has realized the functions for collecting, display, storing, printing ... control cabin is independent and lifted hydraulically (ZJ70DBS), without contacting the drill floor, with little vibration, and convenient for installation and ... ,50,70,90DBS,drill rig,factory price,09new style,tech from USA