Portable teaching machines,申请号US19610100846-传众专利搜索

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发明名称	Portable teaching machines
摘要
申请公布号	US3105307(A)	申请公布日期	1963.10.01
申请号	US19610100846	申请日期	1961.04.05
申请人	TEACHING MACHINES, INC.	发明人	III DUDLEY E. CORNELL
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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