FILE – In this June 24, 2014 file photo, hows the Draganflyer X4-ES drone, a professional, GPS guided, four-rotor UAV helicopter capable of autonomous flight, video and digital still images, during a demonstration in Grand Forks, N.D. Organizers of an annual unmanned aircraft conference are calling North Dakota the Silicon Valley of the drone world. Some of the top aerospace experts in the country are meeting Wednesday, Sept. 23, 2015, […]
Source: Best Flying Drones
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