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发明名称
Schulrechenmaschine für kinder
摘要
申请公布号
DE1427721(U)
申请公布日期
1938.01.22
申请号
DE19371427721U
申请日期
1937.09.04
申请人
发明人
分类号
G09B1/20
主分类号
G09B1/20
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代理人
主权项
地址
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