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发明名称
Retrievable formation tester
摘要
申请公布号
US2256552(A)
申请公布日期
1941.09.23
申请号
US19400324809
申请日期
1940.03.19
申请人
DRAKE HUGH E
发明人
DRAKE HUGH E.
分类号
E21B49/08
主分类号
E21B49/08
代理机构
代理人
主权项
地址
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