Drone tech company Elistair has invented a giant extension cord that keeps a drone tethered to the ground, but flying for much longer.
원문출처 : https://www.cnn.com/videos/business/2019/03/04/drones-on-a-leash-lon-orig.cnn
원문출처 : https://www.cnn.com/videos/business/2019/03/04/drones-on-a-leash-lon-orig.cnn