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"I myself feel that our country, for whose Constitution I fought in a just war, might as well have been invaded by Martians and body snatchers."
- Kurt Vonnegut, Jr.

Airlock  
  An intermediate chamber between airless space and the interior of a space craft.  

How can you go between the void of space and oxygen-rich interior of your space craft?

DuQuesne reported briefly to the two girls. All three put on space-suits and crowded into the tiny airlock. The lock was pumped down.
From Skylark of Space, by E.E. 'Doc' Smith.
Published by Not known in 1928
Additional resources -

The phrase "air lock" and the basic purpose was first used in the mid-19th century in relation to sea-going vessels.

This is perhaps the earliest usage of the phrase in science fiction. However, the idea was put forward much earlier; see the entry for the double-door vestibule from Astor's 1894 novel A Journey in Other Worlds.

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Additional resources:
  More Ideas and Technology from Skylark of Space
  More Ideas and Technology by E.E. 'Doc' Smith
  Tech news articles related to Skylark of Space
  Tech news articles related to works by E.E. 'Doc' Smith

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