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发明名称
Means for rotating pump rod in a well
摘要
申请公布号
US2180880(A)
申请公布日期
1939.11.21
申请号
US19380217329
申请日期
1938.07.05
申请人
POULSEN ALFRED E
发明人
POULSEN ALFRED E.
分类号
F04B53/14
主分类号
F04B53/14
代理机构
代理人
主权项
地址
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