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发明名称
Improvements in or relating to steel girders for ferroconcret ribbed ceilings
摘要
申请公布号
GB832839(A)
申请公布日期
1960.04.13
申请号
GB19570027400
申请日期
1957.08.30
申请人
WILLY KAISER
发明人
分类号
E04C5/065
主分类号
E04C5/065
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代理人
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