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Typed in black ink on off-white paper. A table containng running hours of the H.P. boilers and H.P. Turbines to 6th November 1952. The annual running hours are provided for 1938-1952 (until the 6th Nov in 1952). Document dated 7th November 1952. Loose within pink/peach card file with other documents relating to Middle Duffryn and Bargoed High Pressure Station.
