Even Etl, in his cage, had an oxygen mask that Klein had made for him.
Ripping off his oxygen mask, he took a deep breath of the alien atmosphere.
So you've always got this oxygen mask on, all the time, except if you take it off for a second to talk to somebody.
Brett was adjusting his oxygen mask with one hand and gripping a paralo-ray gun tightly with the other.
A nurse was near by with a tray of hypodermics and an oxygen mask.
Astro opened the valve on Brett's oxygen mask wide and waited until the man was breathing normally.
Over its mouth-palps was the cup of what must have been its oxygen mask.
His oxygen mask was still in place, but his helmet hung partly loose.
He breathed the heavy air appreciatively, fingering the oxygen mask he had to wear outside.
In the excitement his oxygen mask had slipped down off his face and he could not reach the tube with his lips.
oxygen mask n.
A masklike device that is placed over the mouth and nose and through which oxygen is supplied from an attached storage tank.