Picturephone

…experimental videophone system, known as Picturephone, in 1963. By 1968 Bell engineers had developed a second-generation Picturephone, which was put into public service in 1971.

…videoconferencing tool—a videophone called the Picturephone—at the World’s Fair. After spending $500 million on development and predicting one million users by 1980, AT&T was stunned when the Picturephone turned out to be a financial failure, garnering only about 500 subscribers.