Stock Photo - An unmanned electric vertical take-off aircraft, a so-called 'Volocopter', is prepared for the start during the presentation in the dm-Arena in Karlsruhe, Germany, 20 November 2013. The helicopter-like vehicle is driven on electric motors and controlled with a joystick and autopilot. In a later stadium of the development, two people will be able to fly in it. Photo: Uwe Anspach/dpa | usage worldwide. - Karlsruhe/Baden-Wuerttemberg/Germany

Stock Photo: An unmanned electric vertical take-off aircraft, a so-called 'Volocopter', is prepared for the start during the presentation in the dm-Arena in Karlsruhe.

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