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发明名称
Lehrmittelgeraet zum Lesen und Rechnen
摘要
申请公布号
DE839121(C)
申请公布日期
1952.05.15
申请号
DE1950R001941
申请日期
1950.06.03
申请人
HEINRICH RUGULLIS
发明人
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
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