"In 1905, with his brother Jacques, and under the guidance of Charles Richet, he began work on a gyroplane (the forerunner of the helicopter) with flexible wings. It achieved the first ascent of a vertical-flight aircraft with a pilot in 1907."[/li]

I think these guys built the first working helicopter, or at least the prototype of the helicopter.

By so called first invented, one looks at the project which continual improvement brought us the product we see today. Innocenzo Manzetti, Antonio Meucci, Johann Philipp Reis, Elisha Gray, Alexander Graham Bell, and Thomas Edison, all did pioneer work concerning the telephone, but only the continual improvement of Alexander Graham Bell's project and patent, from which other patents for electric telephone devices and features flowed, is considered as the prime-invention, or first invented.


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