Drill bits with dropping tendencies,申请号GB20080021536-传众专利搜索

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发明名称	Drill bits with dropping tendencies
摘要
申请公布号	GB2453875(B)	申请公布日期	2009.08.19
申请号	GB20080021536	申请日期	2007.10.02
申请人	SMITH INTERNATIONAL, INC.	发明人	CARL M HOFFMASTER;MICHAEL GEORGE AZAR
分类号	E21B10/42;E21B7/04;E21B7/06;E21B10/43	主分类号	E21B10/42
代理机构		代理人
主权项
地址

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