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Amgueddfa Cymru – Museum Wales
Photocopy on white paper, with some areas coloured in pink, yellow and blue pencil. Full title: 'Foster Carbon Hearth for No.1 Blast Furnace. Dorman Long & Co. Ltd. Cleveland Works, Middlesbrough.' Engineers drawing by Henry Foster & Co. Ltd. Dated 29-4-48 Drawing No. 1147.
