Apparatus for teaching and learning basic arithmetic,申请号US19600054624-传众专利搜索

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发明名称	Apparatus for teaching and learning basic arithmetic
摘要
申请公布号	US3061947(A)	申请公布日期	1962.11.06
申请号	US19600054624	申请日期	1960.09.08
申请人	FAUDREE DORIS W	发明人	FAUDREE DORIS W.
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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