Improvements in or relating to microphones,申请号GB19320034443-传众专利搜索

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发明名称	Improvements in or relating to microphones
摘要
申请公布号	GB400440(A)	申请公布日期	1933.10.26
申请号	GB19320034443	申请日期	1932.12.05
申请人	MARCONI'S WIRELESS TELEGRAPH COMPANY, LIMITED	发明人
分类号	H04R7/22	主分类号	H04R7/22
代理机构		代理人
主权项
地址

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