Improvements in or relating to microphones,申请号GB19340022983-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	GB442531(A)	申请公布日期	1936.02.10
申请号	GB19340022983	申请日期	1934.08.08
申请人	HENRY JOSEPH ROUND	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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