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发明名称
Roller cutter drill bit
摘要
申请公布号
EP0737797(A3)
申请公布日期
1997.10.08
申请号
EP19960301974
申请日期
1996.03.22
申请人
CAMCO INTERNATIONAL INC.
发明人
PEARCE, DAVID E.;WALTER, JAMES C.
分类号
E21B10/18;(IPC1-7):E21B10/18
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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