#steel_arch_bridge  a steel bridge constructed in the form of an arch
  supertype:  #bridge__span  a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
  instance:  #Sydney_Harbor_Bridge
  subtype:  #Bayonne_Bridge  a steel arch bridge connecting New Jersey and Staten Island at Bayonne, New Jersey
  subtype:  #New_River_Gorge_Bridge  a steel arch bridge across New River at Fayetteville, West Virginia

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