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"the [science fiction] writer should be able to convince the reader (and himself) that the wonders he is describing really can come true...and that gets tricky when you take a good, hard look at the world around you."
- Frederik Pohl

Rocket-Belt  
  A single-user propulsion pack.  

It was a rocket-belt, one of several that lay there. Strapped on and touched off, it would carry him to safety.

He quickly wriggled into the harness. The motor and tube fitted on his back like a knapsack.

From The Worlds of Tomorrow, by Manly Wade Wellman.
Published by Thrilling Wonder Stories in 1940
Additional resources -

Compare to the Floater from Armageddon: 2419 A.D., by Philip Frances Nowlan, published by Amazing Stories in 1928, and the jump harness from Stranger in a Strange Land, by Robert Heinlein, published by Putnam in 1961.

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  More Ideas and Technology from The Worlds of Tomorrow
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