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发明名称
CENTRALISING DOWN-WELL LOCATION SENSOR
摘要
申请公布号
GB2173533(A)
申请公布日期
1986.10.15
申请号
GB19860008354
申请日期
1986.04.04
申请人
* DREXEL EQUIPMENT
发明人
RICHARD ALVIN * ARMELL
分类号
E21B17/10;E21B47/09;(IPC1-7):E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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