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发明名称
摘要
申请公布号
BE710435(A)
申请公布日期
1968.06.17
申请号
BED710435
申请日期
1968.02.07
申请人
发明人
分类号
E04H7/20;G21C13/06;G21C13/093
主分类号
E04H7/20
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