Improvements in or relating to telephone transmitters,申请号GB19380035967-传众专利搜索

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发明名称	Improvements in or relating to telephone transmitters
摘要
申请公布号	GB522226(A)	申请公布日期	1940.06.12
申请号	GB19380035967	申请日期	1938.12.09
申请人	FREDERIC GUILLAUME FRIEBEL	发明人
分类号	H04R21/02	主分类号	H04R21/02
代理机构		代理人
主权项
地址

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