File:Technische-Universitaet-Berlin-Ernst-Ruska-Gebaeude-Treppe.jpg
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![File:Technische-Universitaet-Berlin-Ernst-Ruska-Gebaeude-Treppe.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Technische-Universitaet-Berlin-Ernst-Ruska-Gebaeude-Treppe.jpg/630px-Technische-Universitaet-Berlin-Ernst-Ruska-Gebaeude-Treppe.jpg?20170321075651)
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