Referenziert von|
| US4331973 | 21. Okt. 1980 | 25. Mai 1982 | Iri, Inc. | Panelist response scanning system | | US4331974 | 21. Okt. 1980 | 25. Mai 1982 | Iri, Inc. | Cable television with controlled signal substitution | | US4404589 | 21. Okt. 1980 | 13. Sept. 1983 | IRI, Inc. | Cable television with multi-event signal substitution | | USRE33808 | 28. Aug. 1985 | 28. Jan. 1992 | Information Resources, Inc. | Cable television with multi-event signal substitution |
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