Audio visual teaching device,申请号US19650450442-传众专利搜索

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发明名称	Audio visual teaching device
摘要
申请公布号	US3350792(A)	申请公布日期	1967.11.07
申请号	US19650450442	申请日期	1965.04.23
申请人	ANDERSEN RALPH V	发明人	ANDERSEN RALPH V.
分类号	G09B5/06	主分类号	G09B5/06
代理机构		代理人
主权项
地址

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