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发明名称
摘要
申请公布号
DE2016639(A1)
申请公布日期
1971.11.18
申请号
DE19702016639
申请日期
1970.04.08
申请人
发明人
分类号
E04C2/292;E04C2/32;E04D3/35;E04D3/367
主分类号
E04C2/292
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