Title:
System and apparatus for determining popularity ratings of different transmitted programs
United States Patent 2766374
US Patent References:
Call selector
- - 2275930

Signal actuated alarm circuit
- - 2287926

Multiple radio recorder
- - 2342167

Radio receiver
- - 2411494

Transmitter adjusting system
- - 2418139


Inventors:
Hoffmann, Allen D.
Publication Date:
10/09/1956
View Patent Images:
Download PDF 2766374 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
INTERNAT TELEMENTER CORP
Primary Class:
346/37
Other Classes:
725/21, 348/E07.042
International Classes:
H04H9/00; H04N7/06
US Patent References:
2512699Radio pulse receiver interference eliminator
2558754Automatic radio listener survey system
2573279System of determining the listening habits of wave signal receiver users
2640874Starting and switching control apparatus for facsimile recorders