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发明名称
Circulation port assemblies for tubing or well pipe
摘要
申请公布号
US2855943(A)
申请公布日期
1958.10.14
申请号
US19560572727
申请日期
1956.03.20
申请人
MOLLER BYNUM W;COURTNEY HORACE L
发明人
MOLLER BYNUM W.;COURTNEY HORACE L.
分类号
E21B34/06;E21B34/14
主分类号
E21B34/06
代理机构
代理人
主权项
地址
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