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发明名称
Well cleaning device
摘要
申请公布号
US2043979(A)
申请公布日期
1936.06.16
申请号
US19350005774
申请日期
1935.02.09
申请人
JOHN GRANT
发明人
BARKELEW JAMES T.;SCANTLEBURY HAROLD E.
分类号
E21B37/08
主分类号
E21B37/08
代理机构
代理人
主权项
地址
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