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"Modern science fiction is the only form of literature that consistently considers the nature of the changes that face us, the possible consequences, and the possible solutions."
- Isaac Asimov

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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