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http://interestingengineering.com/worlds-first-manned-hydrogen-helicopter-is-in-the-works
http://newatlas.com/aircraft/world-first-hydrogen-helicopter-evtol/
http://piasecki.com/projects/pa-890-evtol-slowed-rotor-winged-compound/2719/
http://www.h2-view.com/story/first-glimpse-at-a-hydrogen-powered-helicopter/
http://interestingengineering.com/japan-tetra-personal-evtol
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http://www.h2-view.com/story/octopus-hydrogen-to-fuel-zero-emission-flights/
http://twitter.com/ZeroAvia?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor
http://www.youtube.com/results?search_query=Zero+Avia