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Demir, Dökme Demir ve Çelik
https://drive.google.com/file/d/1t9iuzlOdIcnzRgOM-JEF3ny23b9KISHt/view?usp=sharing DEMİR VE ÇELİK
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https://drive.google.com/file/d/1t9iuzlOdIcnzRgOM-JEF3ny23b9KISHt/view?usp=sharing DEMİR VE ÇELİK