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发明名称
Pump jack
摘要
申请公布号
US2452087(A)
申请公布日期
1948.10.26
申请号
US19450597636
申请日期
1945.06.05
申请人
WAGNER ROY W
发明人
WAGNER ROY W.
分类号
F04B47/00
主分类号
F04B47/00
代理机构
代理人
主权项
地址
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