DEVICE FOR CONTROLLING THE WEIGHT ON AN EARTH DRILL BIT,申请号EP19960920757-传众专利搜索

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发明名称	DEVICE FOR CONTROLLING THE WEIGHT ON AN EARTH DRILL BIT
摘要
申请公布号	EP0828923(B1)	申请公布日期	1999.08.18
申请号	EP19960920757	申请日期	1996.05.30
申请人	SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.	发明人	VAN DEN STEEN, LEON;ZIJSLING, DJURRE, HANS
分类号	E21B17/07;E21B21/10;E21B44/00;E21B44/06;(IPC1-7):E21B44/00	主分类号	E21B17/07
代理机构		代理人
主权项
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