Educational matter,申请号US19630321795-传众专利搜索

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发明名称	Educational matter
摘要
申请公布号	US3233343(A)	申请公布日期	1966.02.08
申请号	US19630321795	申请日期	1963.11.06
申请人	EMMETT SHORT DAVID	发明人	SHORT DAVID EMMETT
分类号	G09B19/26	主分类号	G09B19/26
代理机构		代理人
主权项
地址

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