Educational palettes or value control palettes,申请号GB19370003849-传众专利搜索

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发明名称	Educational palettes or value control palettes
摘要
申请公布号	GB485126(A)	申请公布日期	1938.05.16
申请号	GB19370003849	申请日期	1937.02.09
申请人	HUGH DE HAVEN	发明人
分类号	G09B19/00	主分类号	G09B19/00
代理机构		代理人
主权项
地址

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