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经营范围
发明名称
Means for flowing wells
摘要
申请公布号
US2396162(A)
申请公布日期
1946.03.05
申请号
US19420456107
申请日期
1942.08.24
申请人
DEMPSEY OSCAR E
发明人
DEMPSEY OSCAR E.
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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