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发明名称
Rechenlehrmittel
摘要
申请公布号
DE572833(C)
申请公布日期
1933.03.23
申请号
DE1931W085420D
申请日期
1931.03.19
申请人
KLAUS WEINANDY
发明人
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
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