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Wikipedia's[3] Manchester Plant article gives the inauguration date as 24 May 1938, on Empire Day.
Council coverage of the factory's history and 88 years of production at the Trafford Park site, corroborating the 1938 opening.
States the Trafford[2] Park factory was inaugurated on 24 May 1938 (Empire Day), built in ten months, and was the largest cereal factory in the British Empire when completed.
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