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Trolley boat on Teltow canal retuschiert f. de Oberleitungsboot auf dem Teltower Kanal Approx lowtechmagazine html LowTech Magazine Doubts on progress and technology Trolley canal boats Unknown photographer derivative work Lmpel Trolley boat on Teltow canal Original Moire entfernt Verzeichnung Farbe und Kontrast korrigiert