Microphone à électrodes en charbon,申请号FRD969788-传众专利搜索

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发明名称	Microphone à électrodes en charbon
摘要
申请公布号	FR969788(A)	申请公布日期	1950.12.26
申请号	FRD969788	申请日期	1948.07.30
申请人	ALBISWERK ZURICH A. G.	发明人
分类号	H04R1/22;H04R21/02	主分类号	H04R1/22
代理机构		代理人
主权项
地址

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