EARTH BORING BITS,申请号GB19790018814-传众专利搜索

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发明名称	EARTH BORING BITS
摘要
申请公布号	GB2021664(B)	申请公布日期	1982.07.28
申请号	GB19790018814	申请日期	1979.05.30
申请人	DRESSER INDUSTRIES INC	发明人
分类号	E21B7/28;E21B10/20;E21B10/34;E21B44/00;(IPC1-7):E21D3/00	主分类号	E21B7/28
代理机构		代理人
主权项
地址

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