Expendable diamond drag bit,申请号US19870109980-传众专利搜索

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发明名称	Expendable diamond drag bit
摘要
申请公布号	US4813500(A)	申请公布日期	1989.03.21
申请号	US19870109980	申请日期	1987.10.19
申请人	SMITH INTERNATIONAL, INC.	发明人	JONES, KENNETH W.
分类号	E21B10/54;E21B10/60;(IPC1-7):E21B10/46	主分类号	E21B10/54
代理机构		代理人
主权项
地址

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