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Amgueddfa Cymru – Museum Wales
British Transport Commission, Mech & Elec Engineers Dept, South Wales Docks plan for Swansea docks. Shows schematic diagram of connections for 6.6K.V. ring main and main radial feeders. Drawing number 2237. Approved 5/2/1954. (Plan amended in 1938.) Black print on cream paper with pink and purple details.
