CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins78% CONFIDENCEOverall confidence: 78%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Wikipedia's[3] H. J. Heinz, Wigan article dates the Kitt Green factory's opening to 21 May 1959.H.J. Heinz opens its Kitt Green factory near Wigan, which grows into the company's largest food processing plant in the world and Europe's biggest.
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