Shale diverting means for a sealed bearing drill bit.,申请号EP19910115379-传众专利搜索

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发明名称	Shale diverting means for a sealed bearing drill bit.
摘要
申请公布号	EP0476505(B1)	申请公布日期	1995.11.15
申请号	EP19910115379	申请日期	1991.09.11
申请人	SMITH INTERNATIONAL, INC.	发明人	OLIVER, MICHAEL S.;CAWTHORNE, CHRIS E.;ERBENECK, GARY
分类号	E21B10/22;E21B10/25;(IPC1-7):E21B10/22;E21B12/06	主分类号	E21B10/22
代理机构		代理人
主权项
地址

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