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World's Greatest Inventions - When Was The Helicopter Invented?

Posted by dglaLearn at 5:08 AM


World's Greatest Inventions - When Was The Helicopter Invented? Flying high up in the sky is not a child's play, however man has managed to do so. How did this invention happen? Don't miss this amazing video that gives you a detailed view on helicopters. Take a look.

 

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Learn English Vocabulary & Help the POOR | Eng Vocab| Link 1 |