Pat. No. 7,806,173. Sept. 20, 1978, “Sistema Colector Solar”. U.S. patent 4,117,682 Oct. 3, 1978. “Solar Collector System”. (Multiple towers, 52 claims...
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Retrieved 2023-05-07. Wikimedia Commons has media related to Darwin glass. http://www.meteorite-times.com/Back_Links/2002/June/colectors_corner.htm...
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