منطقة الرور ، السدورف ، التعدين ، هندسة معمارية ، صلب ، أزرق ، هيكل بني ، صناعة البناء والتشييد ، المبنى الخارجي ، معدن ، صناعة
الصور ذات الصلة الخالية من حقوق الملكية
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