EARTH BORING BIT,申请号GB19790014974-传众专利搜索

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发明名称	EARTH BORING BIT
摘要
申请公布号	GB2020715(B)	申请公布日期	1982.06.09
申请号	GB19790014974	申请日期	1979.04.30
申请人	DRESSER INDUSTRIES INC	发明人
分类号	E21B10/16;E21B10/52;(IPC1-7):E21B9/10	主分类号	E21B10/16
代理机构		代理人
主权项
地址

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