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A Most Useful Invention: The Helicopter

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Matchstick Mavericks: Crafting Mini Helicopters That Fly!

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15 INSANE Homemade Helicopters - BAD IDEA

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The GENIUS who Invented The Helicopter At The Age Of 12

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Igor Sikorsky, inventor of the helicopter. 1939

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Homemade helicopter in Eswatini.

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Money Talks: Ugandan inventor builds home-made helicopter

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15 MOST Beautiful Biplanes Ever Made

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카자흐스탄에서 여객기 추락‥\

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Igor Sikorsky, Aviation Genius And Engineering Pioneer | A Biography Upscaled 4K Video

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The Invention and Development of Rotorcraft (3): Early Helicopter

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Igor Sikorsky's First Successful Helicopter | The Henry Ford's Innovation Nation

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The First Flight of the First Practical Helicopter

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