Screw drill for petroleum drilling machinery
GAO YUNCHONG, GUAN SHIQUAN, HUO JINMING, YANG QIANG, YIN JICHENG, TIAN XINGUO
Year of Publication 29.12.2020
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Year of Publication 29.12.2020
Patent
Underground vibration damper while drilling
GUAN SHIQUAN, GAO YUNCHONG, HUO JINMING, YANG QIANG, YIN JICHENG, TIAN XINGUO
Year of Publication 20.11.2020
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Year of Publication 20.11.2020
Patent