Title:
System and apparatus for determining popularity ratings of different transmitted programs
United States Patent 2766374
Inventors:
Hoffmann, Allen D.
Publication Date:
10/09/1956
Export Citation:
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Assignee:
INTERNAT TELEMENTER CORP
Primary Class:
346/37
Other Classes:
348/E7.042, 725/21
International Classes:
H04H60/37; H04H60/44; H04N7/06; H04H20/31; H04H1/00; H04N7/06
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US Patent References:
2640874Starting and switching control apparatus for facsimile recorders
2573279System of determining the listening habits of wave signal receiver users
2558754Automatic radio listener survey system
2512699Radio pulse receiver interference eliminator
2418139Transmitter adjusting system
2411494Radio receiver
2342167Multiple radio recorder
2287926Signal actuated alarm circuit
2275930Call selector