Search signal apparatus for determining the listening habits of wave signal receiverusers,申请号US19470781989-传众专利搜索

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发明名称	Search signal apparatus for determining the listening habits of wave signal receiverusers
摘要
申请公布号	US2660665(A)	申请公布日期	1953.11.24
申请号	US19470781989	申请日期	1947.10.24
申请人	A. C. NIELSEN COMPANY	发明人	SCHERBATSKOY SERGE A.
分类号	H04H60/43	主分类号	H04H60/43
代理机构		代理人
主权项
地址

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