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发明名称
Procédé de fabrication d'une poutrelle creuse, poutrelle fabriquée d'après ce procédé et lève-charge
摘要
申请公布号
FR1135817(A)
申请公布日期
1957.05.03
申请号
FRD1135817
申请日期
1955.08.10
申请人
发明人
BAAS ERWIN
分类号
B21C37/15;B21C37/16;E02F3/34;E02F3/36
主分类号
B21C37/15
代理机构
代理人
主权项
地址
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