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"We [science fiction writers] always wanted to believe in "private sector" space -- hucksters make better characters than a government does."
- Larry Niven

Psycho-Phone  
  A device that recorded and played back the thoughts of the user.  

...the art of penmanship had disappeared with the invention of the psycho-phone, an instrument that directly transferred and preserved the thoughts of a person, so that at any future time the small glass cylinder could be inserted into a radio and repeat the thought. This machine had completely supplanted the pen and typewriter in the commercial, literary and educational life. Only a few of the savants was able to write...
From A Biological Experiment, by David H. Keller.
Published by Amazing Stories in 1928
Additional resources -

See also the espionage machine from Cordwainer Smith's 1958 story No, No, Not Rogov!. Also, an earlier reference to the idea that one person can actually experience the transmitted experience of another can be found in the wonderful 1939 story Masson's Secret, by Raymond Z. Gallun. Read about the neuronic receptor-transmitter. See also the Life Chamber from The Chamber of Life, by G. Peyton Wertenbaker., published by Amazing Stories in 1929.

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Additional resources:
  More Ideas and Technology from A Biological Experiment
  More Ideas and Technology by David H. Keller
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  Tech news articles related to works by David H. Keller

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