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发明名称
LEHRGERAET FUER DEN LESE- UND RECHENUNTERRICHT.
摘要
申请公布号
DE1618331(U)
申请公布日期
1950.12.28
申请号
DE195000S2316U
申请日期
1950.11.09
申请人
HELMUTH SAAK
发明人
HELMUTH SAAK
分类号
主分类号
代理机构
代理人
主权项
地址
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