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they invented planes on the 17th of December 1903
Answer2
I suggest that the date of an invention and the date it worked are not necessarily the same. The first flight by an aeroplane is generally accepted to be 17th of December 1903. But the concept must have been months or years before this. But who knows when the first thought process started? In fact Leornardo da Vinci in the 1400-1500s had the idea for a helicopter. Does that make him the inventor of the helicopter? And are you counting a a helicopter as an aeroplane in your question?
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