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Blueprint of technical drawing. Full title: 'Diagram of blast furnace lines for furnace No.1, 3 & 7 determined by nose line of cooling blocks at bosh and inwall and nose line of Tuyere. Coolers at Hearth, irrespective of brickwork'. Drawing of the Dominion Steel & Coal Corp., Ltd., Sydney, Nova Scotia. Dated June 16th, 1947.
