China began to show interest in aerostats in the 1990s, but it was only in 2010-11 that it received three large-sized tethered aerostat systems from a Russian ...
http://bit.ly/2Fgt55D
China began to show interest in aerostats in the 1990s, but it was only in 2010-11 that it received three large-sized tethered aerostat systems from a Russian ...
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