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发明名称
Method for detecting oil in well drilling
摘要
申请公布号
US2342273(A)
申请公布日期
1944.02.22
申请号
US19400353201
申请日期
1940.08.19
申请人
HAYWARD JOHN T
发明人
HAYWARD JOHN T.
分类号
E21B49/00
主分类号
E21B49/00
代理机构
代理人
主权项
地址
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