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发明名称
Well flowing device
摘要
申请公布号
US2143450(A)
申请公布日期
1939.01.10
申请号
US19380199980
申请日期
1938.04.04
申请人
PIPPENGER JOHN E
发明人
PIPPENGER JOHN E.
分类号
E21B37/04
主分类号
E21B37/04
代理机构
代理人
主权项
地址
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