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发明名称
Oil saver
摘要
申请公布号
US2212040(A)
申请公布日期
1940.08.20
申请号
US19380210625
申请日期
1938.05.28
申请人
PARRISH BENJAMIN E
发明人
PARRISH BENJAMIN E.
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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