Matériel didactique pour l'étude des fractions.,申请号BE19600594209-传众专利搜索

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发明名称	Matériel didactique pour l'étude des fractions.
摘要
申请公布号	BE594209(A1)	申请公布日期	1960.12.16
申请号	BE19600594209	申请日期	1960.08.18
申请人	DESOER	发明人
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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