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发明名称
Method and means for constructing tunnel stations
摘要
申请公布号
US1800819(A)
申请公布日期
1931.04.14
申请号
US19300464746
申请日期
1930.06.30
申请人
MASON & HANGER COMPANY, INC.
发明人
DONALDSON FRANCIS
分类号
E21D11/12
主分类号
E21D11/12
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代理人
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