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"Individual science fiction stories may seem as trivial as ever to the blinder critics and philosophers of today -- but the core of science fiction, its essence has become crucial to our salvation if we are to be saved at all."
- Isaac Asimov

Ingestible Communication Capsule  
  A tiny transmitter that can be swallowed, which makes possible voice communication.  

And while you're changing suits you'd better put on some stuff I've got here--Service special phones and detectors. Stick this little disk onto your chest with this bit of tape; low down, out of sight. Just under your wishbone is the best place. Take off your wrist-watch and wear this one continuously--never take it off for a second. Put on these pearls, and wear them all the time, too.

Take this capsule and hide it against your skin, some place where it can't be found except by the most rigid search. Swallow it in an emergency--it goes down easily and works just as well inside as outside. It is the most important thing of all--you can get along with it alone if you lose everything else, but without that capsule the whole system's shot to pieces. With that outfit, if we should get separated, you can talk to us--we're both wearing 'em, although somewhat different forms. You don't need to talk loud--just a mutter will be enough. They're handy little outfits, almost impossible to find, and capable of a lot of things."

From Triplanetary, by E.E. 'Doc' Smith.
Published by Not known in 1934
Additional resources -

Compare to the taprisiot monitor bead from Frank Herbert's 1977 novel The Dosadi Experiment.

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