Stock Photo - Development engineer for drones, Gerd Jacobs, works on the propeller of quadrocopter, a drone powered by four propellers, at the workshop of Cooper Copter, a company specialising in the manufacture of civilian drones, in Hamburg, Germany, 6 April 2016. The company hosted a conference on 'Drones: Technology, hype and risks'. Photo: Axel Heimken/dpa | usage worldwide. - Hamburg/Hamburg/Germany

Stock Photo: Development engineer for drones, Gerd Jacobs, works on the propeller of quadrocopter, a drone powered by four propellers, at the workshop of Cooper Copter.

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