File:Hot blast furnace 2, Otto's Encyclopedia.jpg
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![File:Hot blast furnace 2, Otto's Encyclopedia.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Hot_blast_furnace_2%2C_Otto%27s_Encyclopedia.jpg/800px-Hot_blast_furnace_2%2C_Otto%27s_Encyclopedia.jpg?20140426195740)
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