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"We didn't have a telephone and our family until I was about 15, in high school."
- Ray Bradbury

Artificial Gravity System  
  Producing a gravity field without a large nearby mass.  

This mention narrowly misses first - I think that Ray Cummings might have edged him out with Brigands of the Moon published March of 1930; see artificial gravity.

An "artificial gravity" system, based on the properties of the electro-magnetic field, could be turned on and regulated at will, so as to maintain a more or less normal environment for the human organism.
From Last and First Men, by Olaf Stapledon.
Published by Not known in 1930
Additional resources -

See the entry for city of space (from The Prince of Space, by Jack Williamson, 1931) for a discussion of centrifugal force-provided "gravity" for space stations in the The Problem of Space Travel - The Rocket Motor, written by Herman Potočnik in 1928.

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  More Ideas and Technology from Last and First Men
  More Ideas and Technology by Olaf Stapledon
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