#oxygen_mask  a breathing device that is placed over the mouth and nose; supplies oxygen from an attached storage tank
  supertype:  breathing_device__breathingdevice__breathingapparatu__breathing_machine__breathingmachine__ventilator  a device that facilitates breathing in cases of respiratory failure
  part of:  aqualung__Aqua-Lung__scuba  a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is acronym for Self Contained Underwater Breathing Apparatus

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