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经营范围
发明名称
Hilfsmittel zur Erlernung der Buchhaltung
摘要
申请公布号
DE531114(C)
申请公布日期
1931.08.07
申请号
DENDATC042490D
申请日期
申请人
WALTHER CONRADT
发明人
分类号
G09B19/18
主分类号
G09B19/18
代理机构
代理人
主权项
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