Improvements in microphones and like instruments,申请号GB19290027086-传众专利搜索

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发明名称	Improvements in microphones and like instruments
摘要
申请公布号	GB318634(A)	申请公布日期	1930.09.18
申请号	GB19290027086	申请日期	1929.09.06
申请人	GESELLSCHAFT FUER ELEKTRISCHE APPARATE M.B.H.	发明人
分类号	H04R1/38	主分类号	H04R1/38
代理机构		代理人
主权项
地址

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