Improvements in or relating to microphones,申请号GB19310020357-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	GB376951(A)	申请公布日期	1932.07.21
申请号	GB19310020357	申请日期	1931.07.15
申请人	SIEMENS & HALSKE AKTIENGESELLSCHAFT	发明人
分类号	A63H33/10;H04R1/22;H04R9/08	主分类号	A63H33/10
代理机构		代理人
主权项
地址

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