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发明名称
摘要
申请公布号
BE711876(A)
申请公布日期
1968.07.15
申请号
BED711876
申请日期
1968.03.08
申请人
发明人
分类号
E04G11/12;E04G17/14
主分类号
E04G11/12
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代理人
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