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发明名称
Telescoping boring bar for earth boring machines
摘要
申请公布号
US1897434(A)
申请公布日期
1933.02.14
申请号
US19300498874
申请日期
1930.11.28
申请人
DEMPSTER MILL MANUFACTURING COMPANY
发明人
LOEBER HERMAN M.;ELLIOTT ANDREW P.
分类号
E21B17/07
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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