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"To get anywhere, or even live a long time, a man has to guess, and guess right, over and over again, without enough data for a logical answer."
- Robert Heinlein

Ultra-Communicator  
  A communication system that transfers voice commands from one person to selected others.  

How can a sergeant-major make himself heard when "all of vast Wentworth Hall fairly trembled under the impact of an all-pervading, lilting, throbbing melody as the world's finest military band crashed into "Our Patrol?"

"Squads left - march!" Although no possible human voice could have been heard in that gale of soul-stirring sound and although Kinnison's lips scarcely moved, his command was carried to the very bones of those for whom it was intended - and to no one else - by the tight-beam ultra-communicators strapped upon their chests. "Close formation - forward - March!"
From Galactic Patrol, by E.E. 'Doc' Smith.
Published by Street and Smith in 1937
Additional resources -

Those of you interested in other forms of personal communcators might want to check out the audio relay (Robert Heinlein, 1951), the distrans (Frank Herbert, 1965) and the communications implant (Niven and Pournelle, 1981).

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Additional resources:
  More Ideas and Technology from Galactic Patrol
  More Ideas and Technology by E.E. 'Doc' Smith
  Tech news articles related to Galactic Patrol
  Tech news articles related to works by E.E. 'Doc' Smith

Ultra-Communicator-related news articles:
  - Hypersonic Sound (HSS) - Loudspeaker Just For You

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