coal pot, ruhr area, duisburg, coke gas, steel mill, heavy industry, thyssenkrupp, alsumer mountain, structural change, flame, darting flame

coal pot, ruhr area, duisburg, coke gas, steel mill, heavy industry, thyssenkrupp, alsumer mountain, structural change, flame, darting flame
coal pot, ruhr area, duisburg, coke gas, steel mill, heavy industry, thyssenkrupp, alsumer mountain, structural change, flame, darting flame
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