Interrogating system for subscription television receivers
United States Patent 3396232
US Patent References:
System for determining listening habits of wave signal receiver users
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/3172948.html
- - 3172948
System for determining listening habits of wave signal receiver users
- - 3058065
/3172948.html
- - 3172948
Inventors:
Hendrickson, Melvin C.
Morris, George V.
Morris, George V.
Publication Date:
08/06/1968
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Export Citation:
Assignee:
ZENITH RADIO CORP
Primary Class:
Other Classes:
346/37, 725/2, 348/E07.070, 380/241, 725/131
International Classes:
H04N7/173