File:Mafa down-draught type of low-shaft furnaces.png
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![File:Mafa down-draught type of low-shaft furnaces.png](https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Mafa_down-draught_type_of_low-shaft_furnaces.png/800px-Mafa_down-draught_type_of_low-shaft_furnaces.png?20230919215244)
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