Perfectionnements aux microphones,申请号FRD714858-传众专利搜索

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发明名称	Perfectionnements aux microphones
摘要
申请公布号	FR714858(A)	申请公布日期	1931.11.21
申请号	FRD714858	申请日期	1931.04.07
申请人	MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED	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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