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Josef Kates built a tic-tac-toe machine taller than the people playing it for the Canadian National Exhibition, using a vacuum tube of his own design. Visitors queued to take a turn, and it was scrapped when the fair closed.
Among the earliest machines built so that members of the public could play a game against electronics, and one of the first to treat difficulty as something an operator could tune to the person in front of it. It also shows how quickly the exhibition hall became the standard place to explain computing to an audience.
