Power line inspectors complete test flight
(chinadaily.com.cn) Updated: 2012-11-22 10:36
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Researchers from the State Grid Corp of 皇冠体育app examine a power transmission line inspection drone in Northwest 皇冠体育app's Qinghai province on Nov 21, 2012. The drones conducted test flights in a high altitude area of 4,500 meters in Qinghai province several days ago. [Photo/Xinhua] |
