Improvements in or relating to audio frequency repeating and amplifying systems,申请号GB19380030269-传众专利搜索

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发明名称	Improvements in or relating to audio frequency repeating and amplifying systems
摘要
申请公布号	GB519486(A)	申请公布日期	1940.03.28
申请号	GB19380030269	申请日期	1938.10.19
申请人	FREDERICK JAMES CHART	发明人
分类号	H03G5/06	主分类号	H03G5/06
代理机构		代理人
主权项
地址

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