In the late 1970s, AT&T's Bell Labs invented the "electronic
blackboard".
It was basically a digitizing tablet that allowed one to draw and transmit
images.
Might anyone know where one exists?  How about similar products prior to
December 1979?  When was the first digitizing tablet invented?
This is research I'm conducting for a client, so any useful leads will be
compensated.
Thanks!
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Sellam Ismail                                        Vintage Computer Festival
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