Perfectionnements aux microphones pour téléphones et machines parlantes, aux pick-ups électriqueset similaires,申请号FRD684049-传众专利搜索

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发明名称	Perfectionnements aux microphones pour téléphones et machines parlantes, aux pick-ups électriqueset similaires
摘要
申请公布号	FR684049(A)	申请公布日期	1930.06.20
申请号	FRD684049	申请日期	1929.10.29
申请人	BUROVOX LIMITED	发明人
分类号	H04R21/04	主分类号	H04R21/04
代理机构		代理人
主权项
地址

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