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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
- Neal Stephenson

Sono-Induction Coils  
  A public address system consisting of buried coils.  

Never give anything away to the nearby enemy; that's the first rule of successful trench warfare.

A rasping, angry voice burst among the quarreling men in Frontline Trench X 32 like a Dongan shell. "Stop that racket, men! Another sound and the entire trench will be shot."

The loud discussion died suddenly; they looked at each other sheepishly. It was the voice of the brigade commander, three miles in the rear and one hundred feet underground. It came through sono-induction coils, vibrated within the circumscribed area of the trench. Outside that area not a whisper could be heard.

From The Shining One, by Nat Schachner.
Published by Astounding Science-Fiction in 1937
Additional resources -

I'm fascinated by the fact that, twenty years after WWI ended, science fiction writers were still trying to figure out a better way to fight it.

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