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"In 1970 I found little difficulty staying 30 years ahead of the man in the street, and now I find it difficult to stay 18 months ahead of the man on the street."
- Vernor Vinge

Bug Chasers  
  Anti-surveillance devices.  

Anyhow, when you and I leave, no THL device is going to monitor our path." He added, half to himself, "That I could detect, anyhow." At his chest he patted a variety of bug chasers; minned electronic instruments that recorded the presence of vid and aud receptors in the vicinity.
From Lies, Inc., by Philip K. Dick.
Published by Fantastic in 1964
Additional resources -

In Dick's universe, "minned" means "miniaturized.

Compare to the vibration screen from The Shining One (1937) by Nat Schachner and the anti-spying device from Foundation (1951) by Isaac Asimov.

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Additional resources:
  More Ideas and Technology from Lies, Inc.
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to Lies, Inc.
  Tech news articles related to works by Philip K. Dick

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