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Typed in black ink on cream paper. A letter adressed to Messrs. Escher Wyss Engineering Works Ltd, regarding the Middle Duffryn 10,000 K.W. turbo alternator, asking for information regarding consumption and performance data etc. Dated 5th December 1952. Loose within pink/peach card file with other documents relating to Middle Duffryn and Bargoed High Pressure Station.
