Betamax

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From Wikipedia:
"Betamax (sometimes called Beta) is a home videocassette tape recording format developed by Sony, released on May 10, 1975. The cassettes contain 1/2-inch (12.7mm)-wide videotape in a design similar to the earlier, professional 3/4-inch (19.05mm) U-matic format. The format is generally considered obsolete, though it is still used in specialist applications by a small minority of people."

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