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"...science fiction is sort of like a sociological genome. It's a huge range of possible futures, most of them useless; some vital. You never really know in advance."
- Peter Watts

Pressor (Pressor Beam)  
  A force-field beam that pushes, rather than pulls.  

Onward and upward flashed the gigantic duplex cone, its entire whirling mass laced and latticed together—into one mammoth unit by green tractor beams and red pressors.
From Spacehounds of IPC, by E.E. 'Doc' Smith.
Published by Amazing Stories in 1931
Additional resources -

The phrase pressor beam is also used in the same book:

We'll have them in three days, and it ought to be fairly simple to dope out the opposite of a tractor, too - a pusher or presser beam.
The opposite of a pressor beam is, of course, a tractor beam.

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Additional resources:
  More Ideas and Technology from Spacehounds of IPC
  More Ideas and Technology by E.E. 'Doc' Smith
  Tech news articles related to Spacehounds of IPC
  Tech news articles related to works by E.E. 'Doc' Smith

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