Leermiddel ten gebruike bij het rekenonderwijs,申请号BE19610605919-传众专利搜索

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发明名称	Leermiddel ten gebruike bij het rekenonderwijs
摘要
申请公布号	BE605919(A1)	申请公布日期	1961.01.08
申请号	BE19610605919	申请日期	1961.07.10
申请人	ELDERT VAN SCHAGEN;WILHELMINA ANDREA DE NACHTEGAAL	发明人	ELDERT VAN SCHAGEN;WILHELMINA ANDREA DE NACHTEGAAL
分类号	(IPC1-7):G09B	主分类号	(IPC1-7):G09B
代理机构		代理人
主权项
地址

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