Improvements in or relating to microphones or electromechanical translating devices of the carbon granule or like type,申请号GB19370005816-传众专利搜索

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发明名称	Improvements in or relating to microphones or electromechanical translating devices of the carbon granule or like type
摘要
申请公布号	GB491216(A)	申请公布日期	1938.08.26
申请号	GB19370005816	申请日期	1937.02.26
申请人	JOHN LESLIE MINTO;ALEXANDER TUTCHINGS;JOHN ANDERSON MCINTOSH	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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