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经营范围
发明名称
Apparatus for, and a Method of, Signalling Within a Borehole While Drilling
摘要
申请公布号
GB2076039(A)
申请公布日期
1981.11.25
申请号
GB19800016759
申请日期
1980.05.21
申请人
RUSSELL ATTITUDE SYSTEMS LTD
发明人
分类号
E21B17/02;E21B47/12;(IPC1-7):E21B47/12
主分类号
E21B17/02
代理机构
代理人
主权项
地址
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