Mounting for loud speakers in pianos,申请号US19290414871-传众专利搜索

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发明名称	Mounting for loud speakers in pianos
摘要
申请公布号	US1994889(A)	申请公布日期	1935.03.19
申请号	US19290414871	申请日期	1929.12.18
申请人	HAMMOND JR JOHN HAYS	发明人	JR. JOHN HAYS HAMMOND,
分类号	H04R1/02	主分类号	H04R1/02
代理机构		代理人
主权项
地址

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