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Fotothek df tg Mathematik Geometrie Schraubenlinie Sule. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Frankfurt Main Ziehen von Schraubenlinien auf eine runde Sule Papier Holzschnitt cm Mathematik Geometrie Schraubenlinie Sule ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft