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Rotatable Horseheads-Providing Clearance Automatically for Workover
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作者 zhang Huiwun Qi Yaohuang zhang shaobo and shi linsong(university of petroleum, dongring) 《China Oil & Gas》 CAS 1995年第4期40-41,共2页
RotatableHorseheads-ProvidingClearanceAutomaticallyforWorkover¥ZhangHuiwun;QiYaohuang;ZhangShaoboandShiLinso... RotatableHorseheads-ProvidingClearanceAutomaticallyforWorkover¥ZhangHuiwun;QiYaohuang;ZhangShaoboandShiLinsong(UniversityofPe... 展开更多
关键词 Beam pumping unit HORSE head WORKOVER
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