Nozzle means for rotary drill bits,申请号US19900502046-传众专利搜索

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发明名称	Nozzle means for rotary drill bits
摘要
申请公布号	US5029656(A)	申请公布日期	1991.07.09
申请号	US19900502046	申请日期	1990.03.30
申请人	CAMCO INTERNATIONAL INC.	发明人	IVIE, CRAIG R.;PEARCE, DAVID E.
分类号	E21B10/16;E21B10/18;E21B10/52	主分类号	E21B10/16
代理机构		代理人
主权项
地址

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