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发明名称
System and apparatus for recording the listening habits of wave signal receiver users
摘要
申请公布号
US2984536(A)
申请公布日期
1961.05.16
申请号
US19570651257
申请日期
1957.04.08
申请人
A. C. NIELSON COMPANY
发明人
KRAHULEC FRED
分类号
H04H60/44;H04H60/66
主分类号
H04H60/44
代理机构
代理人
主权项
地址
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