DRILL BIT WITH IMPROVED STEERABILITY,申请号EP19890100960-传众专利搜索

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发明名称	DRILL BIT WITH IMPROVED STEERABILITY
摘要
申请公布号	EP0325272(A3)	申请公布日期	1990.02.07
申请号	EP19890100960	申请日期	1989.01.20
申请人	EASTMAN CHRISTENSEN COMPANY	发明人	TIBBITTS, GORDON A.;JONES, MARK L.
分类号	E21B7/06;E21B10/46;E21B17/10;(IPC1-7):E21B10/46	主分类号	E21B7/06
代理机构		代理人
主权项
地址

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