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Drilling Depth 400m Exploration Drilling Rig Sampling Drilling Rig Yg-400RC Reverse Circulation Drilling Rig, Find Details and Price about Reverse Circulation Drilling Rig Drilling Rig from Drilling Depth 400m Exploration Drilling Rig Sampling Drilling Rig Yg-400RC Reverse Circulation Drilling Rig - Zhengzhou Yugong Automation Equipment Co., Ltd.