METHOD AND APPARATUS FOR PROVIDING A MAGNETIC DIRECTION REFERENCE,申请号EP19970937663-传众专利搜索

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发明名称	METHOD AND APPARATUS FOR PROVIDING A MAGNETIC DIRECTION REFERENCE
摘要
申请公布号	EP0918920(A1)	申请公布日期	1999.06.02
申请号	EP19970937663	申请日期	1997.08.19
申请人	TECH-21 LIMITED	发明人	JAMIESON, ANGUS
分类号	E21B47/02;E21B47/022;G01C17/38;(IPC1-7):E21B47/022	主分类号	E21B47/02
代理机构		代理人
主权项
地址

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