Stock Photo - Two drones in flight during a demonstration in Langen, Germany, 5 July 2017. The German Air Navigation Service (DFS) hosted an event providing information on the uses and dangers of drones. German Telecom co-hosted the event. Photo: Andreas Arnold/dpa. - Langen/Hesse/Germany

Stock Photo: Two drones in flight during a demonstration in Langen, Germany, 5 July 2017. The German Air Navigation Service (DFS) hosted an event providing information on.

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