#vacuum_flask__vacuum_bottle  flask with double walls separated by vacuum; used to maintain substances at high or low temperatures
  supertype:  #flask  bottle that has a narrow neck
  subtype:  #Dewar_flask__Dewar  vacuum flask that holds liquid air or helium for scientific experiments
  subtype:  #thermos_bottle__thermosbottle__thermos__thermos_flask__thermosflask  vacuum flask that preserves temperature of hot or cold drinks

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