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Typed in black ink on thin, off-white paper. Boiler tests for the No.12 boiler on the 2 March 1932 and the No.11 boiler on 11th October 1932 at Middle Duffryn Power Station. 12 pages in total, held together by a staple in the top left hand corner. Loose within pink/peach card file with other documents relating to Middle Duffryn and Bargoed High Pressure Station.
