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"We [science fiction writers] always wanted to believe in "private sector" space -- hucksters make better characters than a government does."
- Larry Niven

Pocket Gravity Nullifier  
  Personal device stops gravity's effect.  

He looked upward as he attempted to visualize more fully the frightfulness of the whole tragedy and gasped in startled consternation. Like feathers that had been left behind after the denser matter had separated and fallen away, he saw men floating gently toward the ground. Several touched the earth lightly and came hurrying toward the rescue party while others were yet high in the air...

For a few minutes the captain was not occupied and Addison asked him concerning the men who floated in the air. “They are using pocket gravity nullifiers. They are an outgrowth of the old type parachute,” the commander answered calmly despite his anxiety. “And see, they are using nullifiers to clear away the wreckage.”

From The Sky Maniac, by Henri Dahl Juve.
Published by Air Wonder Stories in 1929
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