Improvements relating to microphone amplifiers,申请号GB19320003518-传众专利搜索

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发明名称	Improvements relating to microphone amplifiers
摘要
申请公布号	GB396707(A)	申请公布日期	1933.08.08
申请号	GB19320003518	申请日期	1932.02.05
申请人	ELECTRICAL RESEARCH PRODUCTS INC.	发明人
分类号	H04R23/02	主分类号	H04R23/02
代理机构		代理人
主权项
地址

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