File:2011-10 comparison of traditional and modern refractories.jpg
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![File:2011-10 comparison of traditional and modern refractories.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/54/2011-10_comparison_of_traditional_and_modern_refractories.jpg/800px-2011-10_comparison_of_traditional_and_modern_refractories.jpg?20111017101359)
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