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Google Patents Hot-blast cupola furnaceÄownload PDF Info Publication number US3599950A US3599950A US3599950DA US3599950A US 3599950 A US3599950 A US 3599950A US 3599950D A US3599950D A US 3599950DA US 3599950 A US3599950 A US 3599950A Authority US United States Prior art keywords tuyeres furnace hearth nozzle blast Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3599950A - Hot-blast cupola furnace