Piano with reaction loud speaker,申请号US19290370484-传众专利搜索

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发明名称	Piano with reaction loud speaker
摘要
申请公布号	US1893892(A)	申请公布日期	1933.01.10
申请号	US19290370484	申请日期	1929.06.13
申请人	HAMMOND JR JOHN HAYS	发明人	JR. JOHN HAYS HAMMOND,
分类号	G10H3/26	主分类号	G10H3/26
代理机构		代理人
主权项
地址

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