Improvements in and relating to deaf aids and microphone amplifiers therefor,申请号GB19360025469-传众专利搜索

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发明名称	Improvements in and relating to deaf aids and microphone amplifiers therefor
摘要
申请公布号	GB481890(A)	申请公布日期	1938.03.18
申请号	GB19360025469	申请日期	1936.09.18
申请人	THOMAS THIRSK	发明人
分类号	H04R25/02	主分类号	H04R25/02
代理机构		代理人
主权项
地址

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