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发明名称
Railroad construction
摘要
申请公布号
US1831701(A)
申请公布日期
1931.11.10
申请号
US19310529266
申请日期
1931.04.10
申请人
EUGENE BRANDT
发明人
BRANDT EUGENE
分类号
E01B5/02
主分类号
E01B5/02
代理机构
代理人
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