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In this photo taken March 28, 2014, Ben Loh, a Ph.D. student from Oklahoma State University, works at a demonstration booth during a drone summit at Northeastern State University in Broken Arrow, Okla. (AP Photo/Tulsa World, Matt Barnard)  ONLINE OUT; KOTV OUT; KJRH OUT; KTUL OUT; KOKI OUT; KQCW OUT; KDOR OUT; TULSA OUT; TULSA ONLINE OUT

In this photo taken March 28, 2014, Ben Loh, a Ph.D. student from Oklahoma State University, works at a demonstration booth during a drone summit at Northeastern State University in Broken Arrow, Okla. (AP Photo/Tulsa World, Matt Barnard) ONLINE OUT; KOTV OUT; KJRH OUT; KTUL OUT; KOKI OUT; KQCW OUT; KDOR OUT; TULSA OUT; TULSA ONLINE OUT

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