Mathematics teaching device,申请号US19670619983-传众专利搜索

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发明名称	Mathematics teaching device
摘要
申请公布号	US3400472(A)	申请公布日期	1968.09.10
申请号	US19670619983	申请日期	1967.03.02
申请人	EDUCATION RESEARCH COUNCIL OF GREATER CLEVELAND	发明人	STRNAD JOHN G.
分类号	G09B23/04	主分类号	G09B23/04
代理机构		代理人
主权项
地址

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