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发明名称
Traverse de chemin de fer en béton armé
摘要
申请公布号
FR1011197(A)
申请公布日期
1952.06.19
申请号
FRD1011197
申请日期
1948.12.23
申请人
DYCKERHOFF & WIDMANN KOMMANDITGESELLSCHAFT
发明人
分类号
E01B3/34
主分类号
E01B3/34
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