#plate_iron__plateiron  a plate of iron
  supertype:  #plate  a sheet of metal or wood or glass or plastic
  subtype:  #boilerplate  thick plate iron used in the production of boilers
  subtype:  #sheet_iron__sheetiron  plate iron thinner than tank iron
  subtype:  #stovepipe_iron__stovepipeiron  plate iron that is thinner than tank iron
  subtype:  #tank_iron  plate iron that is thinner than boilerplate but thicker than sheet iron or stovepipe iron

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