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发明名称
Centralizing means for borehole apparatus
摘要
申请公布号
US2931440(A)
申请公布日期
1960.04.05
申请号
US19560571627
申请日期
1956.03.15
申请人
SCHLUMBERGER WELL SURVEYING CORPORATION
发明人
LEBOURG MAURICE P.
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
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