Modern-day design Helicopter App Download | Inventions MCQ PDF e-Book
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The MCQ: In which one of the following dates World first practical helicopter took flight; "Modern-day design Helicopter MCQ" App Download [Free] with answers: 1888, 1939, 1760, and 1952 for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Apple Book (Free Sample) for school certificate.
In which one of the following dates World first practical helicopter took flight?
Which one of the following scientist invents the Helicopter?
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