#steel_mill__steelmill__steelworks__steel_plant__steelplant__steel_factory__steelfactory  a factory where steel is made
  supertype:  #factory__mill__manufacturing_plant__manufacturingplant__manufactory  a plant consisting of buildings with facilities for manufacturing
  part:  #Bessemer_converter  #blast_furnace  #Stassano_furnace
  subtype:  #rolling_mill__rollingmill  steel mill where metal is rolled into sheets and bars

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