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发明名称
Rechenlehr- und -lerngeraet fuer die ersten Schuljahre
摘要
申请公布号
DE842868(C)
申请公布日期
1952.07.03
申请号
DE1951R005596
申请日期
1951.03.20
申请人
ROGARD ARNO
发明人
ROGARD ARNO
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
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