#steam_boiler__steamboiler__boiler  sealed vessel where water is converted to steam
  supertype:  #vessel  an object used as a container (especially for liquids)
  subtype:  #auxiliary_boiler  an extra boiler (as a ship's boiler that is used while the ship is in port)
  part:  #steam_whistle
  part of:  #heating_system  #steam_engine
  member:  #boilerplate  thick plate iron used in the production of boilers

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