I want to know the answer to the following question:
What was the name of AT&T's videophone device?
All the background I'm provided with is that "One of the first demonstrations of the ability for telecommunications to help sign language users communicate with each other occurred when AT&T's videophone (trademarked as the "Picturephone") was introduced to the public at the 1964 New York World's Fair –two deaf users were able to communicate freely with each other between the fair and another city.". Is that enough to answer the question?