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== History ==
The idea of coaxial rotors originates with [[Mikhail Lomonosov]]. He had developed a small helicopter model with coaxial rotors in July
In 1859, the British Patent Office awarded the first helicopter patent to Henry Bright for his coaxial design. From this point, coaxial helicopters developed into fully operational machines as we know them today.<ref>[http://www.humanpoweredhelicopters.org/articles/nasa-tp-3675.pdf NASA Technical Paper 3675] {{webarchive|url=https://web.archive.org/web/20120522075851/http://www.humanpoweredhelicopters.org/articles/nasa-tp-3675.pdf |date=2012-05-22 }}</ref><ref>[http://terpconnect.umd.edu/~leishman/Aero/history.html A History of Helicopter Flight ] {{webarchive|url=https://web.archive.org/web/20140713201846/http://terpconnect.umd.edu/~leishman/Aero/history.html |date=2014-07-13 }} , J. Gordon Leishman
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