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发明名称
Two-zone pumping system and method
摘要
申请公布号
US2822757(A)
申请公布日期
1958.02.11
申请号
US19550492690
申请日期
1955.03.07
申请人
KOBE, INC.
发明人
COBERLY CLARENCE J.
分类号
E21B43/14
主分类号
E21B43/14
代理机构
代理人
主权项
地址
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