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Amgueddfa Cymru – Museum Wales
British Transport Commission, Mech & Elec Engrs. Department, South Wales Docks, revised proposed route of the 6.6 KV ring main at Swansea Docks. Drawing number 2279. Amended 22 Aug, 1938. Black print on cream paper with some areas shaded in blue and lines hand drawn in coloured pencil. At top of diagram was printed 'G.W.R' but this has been crossed out by hand and 'B.T.C.' written instead.
