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"I was perfectly satisfied to write science fiction knowing that it would pay very little, that it would be seen by only a very few people."
- Isaac Asimov

Videophone  
  A person-to-person communication device that can transmit both picture and sound.  

I'm not sure if this is the first use of the term; van Vogt is certainly not the first sf writer to use the idea.

He closed the door, fastened the three plasto-windows and put a tracer on his videophone.
From World of Null-A, by A.E. van Vogt.
Published by Astounding SF in 1945
Additional resources -

For an earlier version of this idea, see the telephot from Hugo Gernsback's classic 1911 novel Ralph 124c 41 +.

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Additional resources:
  More Ideas and Technology from World of Null-A
  More Ideas and Technology by A.E. van Vogt
  Tech news articles related to World of Null-A
  Tech news articles related to works by A.E. van Vogt

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