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"We're about 20 minutes away from the point where Clarke's law kicks in and technology becomes indistinguishable from magic."
- Peter Watts

Oxygen Freshener  
  A device that removed carbon dioxide from air and replaced it with fresh oxygen.  

"...Each of the suits has an oxygen freshener. Bring them here, Sven."

...Murkitt detached one of the fresheners from the inside of its overall. It was a brick-shaped piece of spongy chemical, processed to precipitate carbon from breathed air and released the freshened oxygen.

"This will break down our output of carbon dioxide for a time," announced Murkitt.

From Lost Rocket, by Manly Wade Wellman.
Published by Astounding Science-Fiction in 1941
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