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"We were essentially being shell-shocked by rapid change. That was one of the things you needed science-fiction writers for back in the Sixties, because we could cope with the future."
- Peter Watts

Electronic Locator  
  A device that determines the location of a person.  

It was on the side of the heel of the right shoe that he found the printed instrument. It was an electronic locator devicemade of the same plastic as the shoe, and recognizable only by the pattern of wires that had been printed from a photographically reduced cut.
From World of Null-A, by A.E. van Vogt.
Published by Astounding SF in 1945
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