Improvements in or relating to educational blocks,申请号GB19320009971-传众专利搜索

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发明名称	Improvements in or relating to educational blocks
摘要
申请公布号	GB404264(A)	申请公布日期	1934.01.11
申请号	GB19320009971	申请日期	1932.04.07
申请人	RUTH WEST	发明人
分类号	G09B17/00	主分类号	G09B17/00
代理机构		代理人
主权项
地址

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