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"I think crypto will slowly percolate its way up and people will adopt it gradually as user friendly, cheap products, become available."
- Neal Stephenson

Televisiophone  
  A device that combines picture with sound for personal communication.  

Suddenly the low hum of the annunciator interrupted their conversation.

"That's Fuller," said one, rising and walking to the televisiophone. He snapped the switch into position, and the grey screen at once misted with color, then a sharp picture leaped out on its dull surface.

"Arco speaking."

"Dr. Arcot," replied the man whose face was imaged in the screen...

From Islands of Space, by John W. Campbell.
Published by Amazing Stories in 1931
Additional resources -

Compare to the visiphone from Triplanetary (1934) by 'Doc' Smith, the photophone from The Planter (1918) by Michael Flynn and the telephot from Ralph 124c 41+ (1911) by Hugo Gernsback.

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Additional resources:
  More Ideas and Technology from Islands of Space
  More Ideas and Technology by John W. Campbell
  Tech news articles related to Islands of Space
  Tech news articles related to works by John W. Campbell

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