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Two engineers at a television manufacturer applied for a patent on a missile game played with knobs against a cathode-ray tube, with targets printed on a plastic overlay taped to the glass. Nothing was ever manufactured.
Here the idea of using a television tube for play is written down, dated and witnessed, twenty years before anyone built a product around it. The patent also shows how much early game hardware came out of wartime electronics, since the mechanism is essentially a radar display with the targets drawn on plastic.