A steel body PDC bit,申请号GB19970011558-传众专利搜索

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发明名称	A steel body PDC bit
摘要
申请公布号	GB9711558(D0)	申请公布日期	1997.07.30
申请号	GB19970011558	申请日期	1997.06.04
申请人	SMITH INTERNATIONAL INC	发明人
分类号	E21B10/42;E21B10/43;E21B10/54;E21B10/55;E21B10/60;E21B17/10	主分类号	E21B10/42
代理机构		代理人
主权项
地址

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