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发明名称
Sand pump
摘要
申请公布号
US2168729(A)
申请公布日期
1939.08.08
申请号
US19370159947
申请日期
1937.08.19
申请人
PAUL CAVINS
发明人
CAVINS PAUL
分类号
E21B27/00
主分类号
E21B27/00
代理机构
代理人
主权项
地址
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