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"I share the view of Pythagoras that the world is number. The ultimate substrate of the universe is math. There's no way to test that - it's pure metaphysical speculation."
- Bart Kosko

Heliocar  
  Ground vehicle that can also lift off like a helicopter.  

He read his story, standing in a busy street that rustled quietly with the whir of moving walks and the barely audible drone of the thousands of electrically driven heliocars which spun smoothly along on rubber-tired wheels, or easily lifted themselves to skimming flight upon whirling helicopters.
From The Prince of Space, by Jack Williamson.
Published by Amazing Stories in 1931
Additional resources -

Compare to the copter harness from The Star Beast (1954) by Robert Heinlein.

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Additional resources:
  More Ideas and Technology from The Prince of Space
  More Ideas and Technology by Jack Williamson
  Tech news articles related to The Prince of Space
  Tech news articles related to works by Jack Williamson

Heliocar-related news articles:
  - PAL-V Liberty Flying Helicopter Car

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