Device for teaching the concept of fractions,申请号GB19640019339-传众专利搜索

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发明名称	Device for teaching the concept of fractions
摘要
申请公布号	GB994340(A)	申请公布日期	1965.06.02
申请号	GB19640019339	申请日期	1964.05.08
申请人	ROBERT JOHN MADER	发明人
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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