almost 4 years
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79 years ago, testing of the Yak-7B prototype began. The Yak-7B was based on a trainer plane developed from the Yak-1. It featured a reduced wingspan, simplified landing gear, and better equipment compared to its predecessor. About 5,000 of the type were produced. http://pbs.twimg.com/media/E1A9PDMWUAIZo0N.jpg