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发明名称
Main valve for well testing tools
摘要
申请公布号
US2126641(A)
申请公布日期
1938.08.09
申请号
US19360076464
申请日期
1936.04.25
申请人
JOHNSTON MORDICA O
发明人
JOHNSTON MORDICA O.
分类号
E21B34/12;E21B49/08
主分类号
E21B34/12
代理机构
代理人
主权项
地址
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