File:Siemens-Martin furnace – longitudinal section, Otto's Encyclopedia.jpg
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![File:Siemens-Martin furnace – longitudinal section, Otto's Encyclopedia.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Siemens-Martin_furnace_%E2%80%93_longitudinal_section%2C_Otto%27s_Encyclopedia.jpg/800px-Siemens-Martin_furnace_%E2%80%93_longitudinal_section%2C_Otto%27s_Encyclopedia.jpg?20140426195925)
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