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发明名称
Pumping jack
摘要
申请公布号
US1976633(A)
申请公布日期
1934.10.09
申请号
US19330680872
申请日期
1933.07.17
申请人
DAVID E. HURD
发明人
RATLEY CLARENCE M.
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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