Procédé et dispositif pour l'accroissement de l'intensité acoustique dans des réceptions microphoniques,申请号FRD838429-传众专利搜索

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发明名称	Procédé et dispositif pour l'accroissement de l'intensité acoustique dans des réceptions microphoniques
摘要
申请公布号	FR838429(A)	申请公布日期	1939.03.06
申请号	FRD838429	申请日期	1938.05.25
申请人		发明人	WENZLER FRANZ
分类号	H04R1/34	主分类号	H04R1/34
代理机构		代理人
主权项
地址

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