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发明名称
Hydraulisk slagbor med stor diameter
摘要
申请公布号
DK0503275(T3)
申请公布日期
1996.09.09
申请号
DK19920102083T
申请日期
1992.02.07
申请人
DAILEY PETROLEUM SERVICES CORP.
发明人
EVANS, ROBERT W.
分类号
E21B4/14;E21B31/113;(IPC1-7):E21B31/113
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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