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发明名称
Pump jack
摘要
申请公布号
US2200790(A)
申请公布日期
1940.05.14
申请号
US19380214108
申请日期
1938.06.16
申请人
ECKERT FELIX H
发明人
ECKERT FELIX H.
分类号
F04B47/02
主分类号
F04B47/02
代理机构
代理人
主权项
地址
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