Talk:Solar heat collector and radiator for building roof
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Useful?[edit]
This article conveys more about Goettl's history in the sheet-metal industry than it does about his invention. I gleaned nothing from the image in the article, and have no idea how this invention works. The article appears to have been written by a German physicist, which is great for the next German physicist who reads the article, but not so great for the average reader.--75.164.155.194 (talk) 03:57, 25 August 2016 (UTC)