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发明名称
Pièce préfabriquée de béton précontraint et notamment traverse de chemin de fer
摘要
申请公布号
FR1544721(A)
申请公布日期
1968.11.08
申请号
FR19670117189
申请日期
1967.08.08
申请人
SOCIETE TECHNIQUE POUR L'UTILISATION DE LA PRECONTRAINTE
发明人
分类号
E01B3/34;E04C3/34
主分类号
E01B3/34
代理机构
代理人
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地址
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