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| 1958 || || Organization founding || [[wikipedia:George Gallup|George Gallup]] consolidates all his polling operations under [[wikipedia:Gallup (company)|Gallup, Inc.]] || [[wikipedia:United States|United States]]
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| 1975 || || Organization founding || [[wikipedia:Ipsos|Ipsos]] is founded by Didier Truchot in Paris, France.<ref name=ipsos-history>{{cite web|url = https://www.ipsos.com/en/our-history|title = Our history|publisher = Ipsos|accessdate = March 18, 2017}}</ref> || [[wikipedia:France|France]] ([[wikipedia:Paris|Paris]])|-
| 1990 || || Organization founding || The Times Mirror Company founds the Times Mirror Center for the People & the Press to conduct polls on politics and policy. This would later become the [[wikipedia:Pew Research Center|Pew Research Center]].<ref name=pew-research-center-history>{{cite web|url = http://www.pewresearch.org/about/our-history/|title = Our History|publisher = [[wikipedia:Pew Research Center|Pew Research Center]]|accessdate = March 18, 2017}}</ref> || [[wikipedia:United States|United States]]
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