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经营范围
发明名称
Rechenlehrmittel
摘要
申请公布号
DE562851(C)
申请公布日期
1932.10.29
申请号
DED562851D
申请日期
申请人
PAUL GERSTNER
发明人
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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