Sound-reproducing system,申请号US19290330952-传众专利搜索

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发明名称	Sound-reproducing system
摘要
申请公布号	US1766046(A)	申请公布日期	1930.06.24
申请号	US19290330952	申请日期	1929.01.07
申请人	FEDERAL TELEGRAPH COMPANY	发明人	PRESCOTT JOHN O.;KOLSTER FREDERICK A.
分类号	G11B7/08;G11B7/24;G11B17/03	主分类号	G11B7/08
代理机构		代理人
主权项
地址

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