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"Science and science fiction, how do you even distinguish the two?"
- Jerry Pournelle

Chin Plates  
  A means of control within a space suit helmet; switching between options with the chin.  

Heinlein liked this idea so much, he reused it the following year in Starship Troopers (see the hands-free helmet).

...the helmet was monstrous. It contained a drinking tank, pill dispensers six on each side, a chin plate on the right to switch radio from "receive" to "send," another on the left to increase or decrease flow of air, an automatic polarizer for the face lens, microphone and earphones, space for radio circuits in a bulge back of the head, and an instrument board arched over the head. The instrument dials read backwards because they were reflected in an inside mirror in front of the wearer's forehead at an effective fourteen inches from the eyes.
Technovelgy from Have Space Suit - Will Travel, by Robert Heinlein.
Published by Scribners in 1958
Additional resources -

You might also be interested in the dental switchboard from The Stars My Destination, a 1956 Alfred Bester novel.

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Additional resources:
  More Ideas and Technology from Have Space Suit - Will Travel
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Have Space Suit - Will Travel
  Tech news articles related to works by Robert Heinlein

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