#firkin.British_capacity_unit  a British unit of capacity equal to 9 imperial gallons
  supertype:  #British_capacity_unit__Imperial_capacity_unit  a unit of measure for capacity officially adopted in the British Imperial System; British units are both dry and wet
  part:  #Imperial_gallon
  part of:  #kilderkin  an obsolete British unit of capacity equal to 18 Imperial gallons

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