Vorrichtung zur Abhaltung von Rechenuebungen,申请号DE19712113562-传众专利搜索

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发明名称	Vorrichtung zur Abhaltung von Rechenuebungen
摘要
申请公布号	DE2113562(A1)	申请公布日期	1972.10.05
申请号	DE19712113562	申请日期	1971.03.20
申请人	BRAUN,KONRAD	发明人	BRAUN,KONRAD
分类号	G09B19/02	主分类号	G09B19/02
代理机构		代理人
主权项
地址

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