Multi-piece rotary cone drill bit seal,申请号GB19990007540-传众专利搜索

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发明名称	Multi-piece rotary cone drill bit seal
摘要
申请公布号	GB9907540(D0)	申请公布日期	1999.05.26
申请号	GB19990007540	申请日期	1999.04.01
申请人	SMITH INTERNATIONAL, INC.	发明人
分类号	E21B10/22;E21B10/25	主分类号	E21B10/22
代理机构		代理人
主权项
地址

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