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"The whole problem of energy sources is going to be solved by little solutions, not by some big new piece of technology that does everything. We got into this crisis by believing that we had one big piece of technology that would do everything (oil)."
- Gregory Benford

Chest Disc  
  A voice activated wireless transmitter.  

The chest discs were likewise self-contained sending sets, strapped to the chest a few inches below the neck and actuated by the vibrations from the vocal cords through the body tissues. The total range of these sets was about eighteen miles. Reception was remarkably clear, quite free from the static of 20th Century radios, and of a strength in direct proportion to the distance of the speaker.
Technovelgy from Armageddon: 2419 A.D., by Philip Frances Nowlan.
Published by Amazing Stories in 1928
Additional resources -

Another exceptional idea, particularly the suggestion that the device is voice-activated by sensing vibration from the vocal chords.

This device is part of a set; see the entry for ultraphone ear-disc.

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Additional resources:
  More Ideas and Technology from Armageddon: 2419 A.D.
  More Ideas and Technology by Philip Frances Nowlan
  Tech news articles related to Armageddon: 2419 A.D.
  Tech news articles related to works by Philip Frances Nowlan

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