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Continuous Mining Machines; Drills & Drilling Equipment, Surface; Parts; Hexin Oil was Founded in 1998 to Fill the Gaps of the Oil Drill Pipe Joint Industry, which has Rewritten the History of Chinese Drill Pipe Industry. the Drill Pipe Joint Blank Maintain the first Sales Among Similar Product Market for Consecutive 12 Years, Mining Industry, Drilling Rig Tools, Mining Machinery ...