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发明名称
Hilfs- und Lernmittel fuer das Zeichnen von Bildern
摘要
申请公布号
DE813614(C)
申请公布日期
1951.09.13
申请号
DE1950B001972
申请日期
1950.02.09
申请人
BRAEUTIGAM WILHELM
发明人
BRAEUTIGAM WILHELM
分类号
G09B11/04
主分类号
G09B11/04
代理机构
代理人
主权项
地址
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