Sound amplifying system,申请号US19300437378-传众专利搜索

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发明名称	Sound amplifying system
摘要
申请公布号	US1872239(A)	申请公布日期	1932.08.16
申请号	US19300437378	申请日期	1930.03.20
申请人	WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY	发明人	BRINDLEY WILLIAM E.
分类号	H04B3/60;H04R27/00	主分类号	H04B3/60
代理机构		代理人
主权项
地址

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