METHOD FOR DETERMINING THE ROTATIONAL SPEED OF A DRILL BIT.,申请号EP19910916343-传众专利搜索

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发明名称	METHOD FOR DETERMINING THE ROTATIONAL SPEED OF A DRILL BIT.
摘要
申请公布号	EP0498876(B1)	申请公布日期	1994.12.14
申请号	EP19910916343	申请日期	1991.08.30
申请人	ELF AQUITAINE PRODUCTION	发明人	DRAOUI, ELYES
分类号	E21B47/00;G01P3/44;G01P7/00;(IPC1-7):E21B47/00	主分类号	E21B47/00
代理机构		代理人
主权项
地址

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