Recording unit for audio teaching equipment,申请号US19630250419-传众专利搜索

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发明名称	Recording unit for audio teaching equipment
摘要
申请公布号	US3306988(A)	申请公布日期	1967.02.28
申请号	US19630250419	申请日期	1963.01.09
申请人	J-B-T INSTRUMENTS, INC.	发明人	ERFF ANTHONY F.
分类号	G09B5/04	主分类号	G09B5/04
代理机构		代理人
主权项
地址

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