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发明名称
Tunnel construction
摘要
申请公布号
US2149232(A)
申请公布日期
1939.02.28
申请号
US19360097583
申请日期
1936.08.24
申请人
EMIL SCHMIDTMANN
发明人
SCHMIDTMANN EMIL
分类号
E21D5/11;E21D11/20
主分类号
E21D5/11
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代理人
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