Bild:LA2-gutbrod-pressure-cooker-1864.png
Wikipedia
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Pressure cooker from tinned cast iron, made by Georg Gutbrod in Stuttgart, Germany.
This picture was scanned in 600 dpi bitonal from an article in Svenska Familj-Journalen, a Swedish monthly magazine from 1864, http://runeberg.org/famijour/1864/0286.html and is in the public domain because its copyright has expired.
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According to the article, the process of tinning cast iron was a trade secret at the time, and the factory of Georg Gutbrod in Stuttgart was the only firm that could deliver pressure cookers in tinned cast iron. Other firms sold pressure cookers made from copper, plate, or untinned cast iron. Gutbrod offered pressure cookers in ten different sizes, sold in Sweden for between 3 and 20 riksdaler.
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