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发明名称
Pump jack
摘要
申请公布号
US2244884(A)
申请公布日期
1941.06.10
申请号
US19400320464
申请日期
1940.02.23
申请人
LAGE FREDERICK A
发明人
LAGE FREDERICK A.
分类号
F04B9/14
主分类号
F04B9/14
代理机构
代理人
主权项
地址
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