Teknologio: silentas la bruon
La ilo estas suna energigo.
http://memolition.com/2015/08/07/solar-powered-noise-barriers-quiet-traffic-while-generating-electricity/ angla
La ilo estas suna energigo.
http://memolition.com/2015/08/07/solar-powered-noise-barriers-quiet-traffic-while-generating-electricity/ angla
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