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发明名称
Search signal apparatus for determining the listening habits of wave signal receiver users
摘要
申请公布号
US2660662(A)
申请公布日期
1953.11.24
申请号
US19470781988
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
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