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History Of The Helicopter Documentary - Helicopter Invention Documentary Film . Apr 28, 2015 . History of Helicopters - Helicopter Invention Documentary .\r
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Igor Sikorsky is considered to be the father of helicopters not because he invented the first. He is called that because he invented the first successful helicopter, .
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History Of The Helicopter Documentary - Helicopter Invention Documentary Film . Apr 28, 2015 . History of Helicopters - Helicopter Invention Documentary .\r
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Igor Sikorsky is considered to be the father of helicopters not because he invented the first. He is called that because he invented the first successful helicopter, .
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