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It is said that the beginning of inventing flying objects started on the 19th century. The goal to make a flying machine started with Otto Lilienthal who makes gliders and the one who created the book about the study of flight which is also know as AERODYNAMICS. Leonardo da vinci draw a sketch of a helicopter at his time and the first successful flying helicopter was designed by the Russian Igor Sikorsky in the late 1939.

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Q: When were planes or helicopters invented?
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