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发明名称
Vorrichtung zum Erlernen der richtigen Handhaltung beim Schreiben
摘要
申请公布号
DE629856(C)
申请公布日期
1936.05.15
申请号
DE1935D070221D
申请日期
1935.04.28
申请人
GERHARD DICK
发明人
分类号
G09B11/02
主分类号
G09B11/02
代理机构
代理人
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地址
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