Mechanical hydraulic type shock absorber
ZHOU GUONING, ZHAO GUANGYOU, SUN WEI, GUO HONGJUN, MA HAIFENG, LU YUEHAI, DONG WANXU, XIN FUYI
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Year of Publication 14.08.2013
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Ground surface bumper jar for drill pipe release
ZHOU GUONING, SHAO SHUAI, ZHAO GUANGYOU, LI XUESONG, WEI ZHONGHE, DONG WANXU, YANG SHUHONG, WEI CAIHE
Year of Publication 05.06.2013
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Year of Publication 05.06.2013
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