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"The SF approach: an awareness that things could have been different, that this is one of many possible worlds, that if you came to this world from some other planet, this would be a science fiction world."
- Neal Stephenson

Mechanical Cobra  
  An assassination device; senses brain waves to find its victim.  

The vengeful "deities" of Roger Zelazny's Lord of Light were able to find and punish unbelievers and dissenters with a mechanical device that used electroencephalogram readings to find its victim

...he's dreamed up some other little jewels, too, to serve the will of the gods ... like a mechanical cobra capable of registering encephalogram readings from a mile away, when it rears and spreads its fan. It can pick one man out of a crowd, regardless of the body he wears. There is no known antidote for its venom.
From Lord of Light, by Roger Zelazny.
Published by Doubleday in 1967
Additional resources -

The phrase 'regardless of the body he wears' refers to the fact that reincarnation is made possible by imposing a person's known electrical brain impulses on a lifeless body grown for the purpose.

This novel is replete with references to mechanical devices that are not only functional machines, but are also either works of art or conscious imitations of nature. William Gibson also creates technovelgy of this kind; see the talking head from Neuromancer.

Philip K. Dick wrote about a similar idea several years earlier; see the entry for cephalotropic dart from his 1964 novel Lies, Inc..

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Additional resources:
  More Ideas and Technology from Lord of Light
  More Ideas and Technology by Roger Zelazny
  Tech news articles related to Lord of Light
  Tech news articles related to works by Roger Zelazny

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