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经营范围
发明名称
Drill bit having enhanced stability
摘要
申请公布号
EP0522553(B1)
申请公布日期
1997.09.17
申请号
EP19920111686
申请日期
1992.07.09
申请人
BAKER-HUGHES INCORPORATED
发明人
JONES, MARK L.;HANSEN, WAYNE R.
分类号
E21B10/42;E21B10/43;E21B10/46;E21B17/10;(IPC1-7):E21B10/46
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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