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"I think crypto will slowly percolate its way up and people will adopt it gradually as user friendly, cheap products, become available."
- Neal Stephenson

Hand-Rocket  
  A handheld device that used reaction matter to aid explorers in space suits to move around easily in zero gee.  

This device solves one of the thought-experiments of early space enthusiasts; how do you move around when freely floating in empty space if you have nothing to push on?

But Kark Al at that moment stepped calmly out from the lock into empty space! The chain at his belt yanked Lalla Dee and Rab and the robot after him. They all floated there in space, a human chain, scraping the hull of the huge liner as it forged onward.

Kark Al's hand-rocket flashed flame, its impulse dragging them all forward. They moved outward from the liner...

From Murder in the Void, by Edmond Hamilton.
Published by Thrilling Wonder Stories in 1938
Additional resources -

Compare with the Reaction Pistol from Gordon A. Giles 1937 story Diamond Planetoid, the Personal Jet Thrust from Robert Heinlein's 1948 novel Space Cadet.

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Additional resources:
  More Ideas and Technology from Murder in the Void
  More Ideas and Technology by Edmond Hamilton
  Tech news articles related to Murder in the Void
  Tech news articles related to works by Edmond Hamilton

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