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GfK - Wikipedia
Fernsehzuschauerforschung: Von der Reichweitenermittlung zur (Werbe-)Wirkungsforschung
GfK on Twitter: "Happy #WorldRadioDay! This year marks 20 years since GfK introduced #MediaWatch, the world's first electronic radio audience measurement meter. Read a #throwback article about its debut into the research
Getreidethermometer DT-20 GFK 2 Meter ø12mm, 179,00 €