Appareil pour la détermination des habitudes d'écoute des usagers des appareils de radio-diffusion,申请号FRD974280-传众专利搜索

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发明名称	Appareil pour la détermination des habitudes d'écoute des usagers des appareils de radio-diffusion
摘要
申请公布号	FR974280(A)	申请公布日期	1951.02.20
申请号	FRD974280	申请日期	1948.10.25
申请人	A. C. NIELSEN COMPANY	发明人
分类号	H04H60/40;H04H60/43	主分类号	H04H60/40
代理机构		代理人
主权项
地址

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