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ancillary annual average basic Bessemer basic oxygen basic oxygen furnace basic oxygen process blast furnace production blast furnace sections capital cent changes coke cold-rolled converters crude steel economic efficiency electric furnaces electric steel employment equipment European Economic Community figures finished fuel gross output growth of labour hearth hot-rolled Hunedoara important improve labour productivity increase ingots input factors installation investment iron and steel Japan labour productivity trends manpower manufacturing measures metal million tons modernization natural gas number of workers open-hearth furnaces open-hearth process open-hearth steel operation output per man-hour percentage period physical units pig-iron production production workers productivity indicators proportion raw materials requirements result rolled products rolling mills salaried staff scrap sector sheet sinter special steel steel industry steel output steel plants steel production steelworks technical technological tinplate Tobata total number total output total production tubes Ukrainian wire Yawata