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Typed in black ink on thin, off-white paper. Some corrections have been handwritten in blue ink. Also a signature and date are handwritten in blue ink. Four page paper/article on the Powell Duffryn Electrical System, held together by a pin in the top left hand corner. Signed at the bottom (possibly the signature of E.I.David) and dated March 12th 1952. Loose within pink/peach card file with other documents relating to Middle Duffryn and Bargoed High Pressure Station.
