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发明名称
Perfectionnements aux poutres
摘要
申请公布号
FR993050(A)
申请公布日期
1951.10.25
申请号
FRD993050
申请日期
1944.11.16
申请人
发明人
ETIENNE ROBERT-HENRI
分类号
E01D6/02;E04C3/10
主分类号
E01D6/02
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