Improvements in or relating to means for assisting and testing the memory,申请号GB19290009885-传众专利搜索

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发明名称	Improvements in or relating to means for assisting and testing the memory
摘要
申请公布号	GB331255(A)	申请公布日期	1930.06.27
申请号	GB19290009885	申请日期	1929.03.27
申请人	AUSTIN GEORGE HUMPHREYS	发明人
分类号	G09B3/04	主分类号	G09B3/04
代理机构		代理人
主权项
地址

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