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"The way you write science fiction is: you sit down at your writing machine and you open your mind to the first thought that comes through."
- Frederik Pohl

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.
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
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