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发明名称
摘要
申请公布号
DE2106921(A1)
申请公布日期
1971.09.09
申请号
DE19712106921
申请日期
1971.02.13
申请人
发明人
分类号
E04G21/12;(IPC1-7):04G21/12
主分类号
E04G21/12
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