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发明名称
Pump jack
摘要
申请公布号
US2109721(A)
申请公布日期
1938.03.01
申请号
US19360111664
申请日期
1936.11.19
申请人
DREVLOW ALVIN J;DREVLOW JOHN C;DREVLOW RICHARD O;HIRAM PETERSON JOHN
发明人
DREVLOW ALVIN J.;DREVLOW JOHN C.;DREVLOW RICHARD O.;PETERSON JOHN HIRAM
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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