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Amgueddfa Cymru – Museum Wales
White typescript on silver/grey background. Full title - 'Experts Report concerning Output Tests with a Brown Boveri Turbo-Compressor for "Powell - Duffryn Steam Coal Company, Ltd." by Prof. P. Ostertag, Engineer. 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'.
