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发明名称
Pumping jack
摘要
申请公布号
US2307952(A)
申请公布日期
1943.01.12
申请号
US19400340737
申请日期
1940.06.15
申请人
THE NATIONAL SUPPLY COMPANY
发明人
PICARD JOHN B.
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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