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Amgueddfa Cymru – Museum Wales
Typed in black ink on cream paper. Also five blueprints on light grey paper. A paper on the 'Power Problem in the Coal Industry' by B.L.Metcalf. Includes five blueprints, with graphs and tables relating to the article. The blueprints have NCB numbers. Loose within a beige/light brown file containing copies of the 'Metcalf papers' and documents relating to the 'Conversion of Turbo Compressor to Electrical Drive'.
