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Amgueddfa Cymru – Museum Wales
Plan "Arrangement of Drawings with 3000KW Turbo Generator Proposition for the Penallta Colliery of the Powell Duffryn Steam Coal co. Ltd." Tender No,81080 The British Westinghouse E & M Co Ltd., Trafford Park, Manchester May 17th 1910. Consulting Engineers Charles P Sparks Esq. 43 Moorgate Place, Moorgate Street E.C.
