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发明名称
Oil saver
摘要
申请公布号
US1871836(A)
申请公布日期
1932.08.16
申请号
US19300497663
申请日期
1930.11.24
申请人
J. E. OLIVER
发明人
BRADFORD WILLIAM G.
分类号
E21B33/08
主分类号
E21B33/08
代理机构
代理人
主权项
地址
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