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Amgueddfa Cymru – Museum Wales
Photocopy of a technical drawing titled "Comparative blast furnace lines No.1 & 4 furnaces." Guest Keen & Nettlefolds Ltd Cardiff Works. Dated October 1st 1929. Drawing No. EE. 00/ 1107. Bblack on cream paper, with some details have been coloured using green and blue pencil.
