Music instruction device for use with the piano,申请号US19430509352-传众专利搜索

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发明名称	Music instruction device for use with the piano
摘要
申请公布号	US2452748(A)	申请公布日期	1948.11.02
申请号	US19430509352	申请日期	1943.11.08
申请人	DAVID GROSCH	发明人	GROSCH DAVID
分类号	G09B15/08	主分类号	G09B15/08
代理机构		代理人
主权项
地址

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