APPARATUS FOR TRANSMITTING INFORMATION FROM A DRILL HOLE TO THE EARTH'S SURFACE,申请号GB19810027945-传众专利搜索

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发明名称	APPARATUS FOR TRANSMITTING INFORMATION FROM A DRILL HOLE TO THE EARTH'S SURFACE
摘要
申请公布号	GB2084224(B)	申请公布日期	1984.08.30
申请号	GB19810027945	申请日期	1981.09.16
申请人	CHRISTENSEN INC	发明人
分类号	E21B4/02;E21B47/00;E21B47/18;(IPC1-7):E21B47/12	主分类号	E21B4/02
代理机构		代理人
主权项
地址

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