#bronze  an alloy of copper and tin and sometimes other elements; also any copper-base alloy containing other elements in place of tin
  supertype:  #copper-base_alloy  any alloy whose principal component is copper
  substance:  #Cu
  subtype:  #gunmetal  a type of bronze used for parts subject to wear or corrosion (especially corrosion by sea water)
  subtype:  #phosphor_bronze  a corrosion-resistant bronze containing phosphorus; used in bearings and gears
  subtype:  #alpha_bronze__alphabronze  a copper-tin alloy that can be worked
  subtype:  #bell_metal  bronze with 3 or 4 parts copper to 1 part tin; used in making bells
  subtype:  #beryllium_bronze__berylliumbronze  a copper-base alloy containing beryllium
  subtype:  #leaded_bronze  bronze to which 1-4% lead is added
  subtype:  #nickel_bronze  a bronze containing up to 30% nickel
  subtype:  #silicon_bronze__siliconbronze  a bronze with 2-3% silicon that is resistant to corrosion

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