Improvements of the carbon microphone,申请号GB19310025633-传众专利搜索

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发明名称	Improvements of the carbon microphone
摘要
申请公布号	GB383348(A)	申请公布日期	1932.11.17
申请号	GB19310025633	申请日期	1931.09.12
申请人	SIEMENS BROTHERS & CO. LIMITED;EDMUND RAMSAY WIGAN	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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