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经营范围
发明名称
Tunnel liner
摘要
申请公布号
US2062706(A)
申请公布日期
1936.12.01
申请号
US19350010690
申请日期
1935.03.12
申请人
THE AMERICAN ROLLING MILL COMPANY
发明人
FREEZE JONATHAN R.;SPAULDING ARCH W.
分类号
E21D11/15
主分类号
E21D11/15
代理机构
代理人
主权项
地址
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