EARTH BORING BIT,申请号GB19780022806-传众专利搜索

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发明名称	EARTH BORING BIT
摘要
申请公布号	GB1602807(A)	申请公布日期	1981.11.18
申请号	GB19780022806	申请日期	1978.05.25
申请人	DRESSER INDUSTRIES INC	发明人
分类号	E21B10/22;E21B10/24;F16N19/00;(IPC1-7):E21B10/22	主分类号	E21B10/22
代理机构		代理人
主权项
地址

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