#bbl__barrel  any of various units of capacity; "a barrel of beer is 31 gallons and a barrel of oil is 42 gallons"
  supertype:  #United_States_liquid_unit  #British_capacity_unit
  part:  #gallon  #Imperial_gallon
  part of:  #hogshead.British_capacity_unit  a British unit of capacity for alcoholic beverages

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