COMPENSATOR FOR EARTH BORING BITS,申请号EP19870630222-传众专利搜索

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发明名称	COMPENSATOR FOR EARTH BORING BITS
摘要
申请公布号	EP0267140(B1)	申请公布日期	1993.03.31
申请号	EP19870630222	申请日期	1987.11.03
申请人	HUGHES TOOL COMPANY	发明人	GALLE, EDWARD M.;ZAHRADNIK, ANTON F.
分类号	E21B10/22;E21B10/24;F16N7/30	主分类号	E21B10/22
代理机构		代理人
主权项
地址

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