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发明名称
Tunnel forming apparatus
摘要
申请公布号
US2823898(A)
申请公布日期
1958.02.18
申请号
US19540452535
申请日期
1954.08.27
申请人
BANKSTON JAMES M
发明人
BANKSTON JAMES M.
分类号
E21B19/084
主分类号
E21B19/084
代理机构
代理人
主权项
地址
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