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Fotothek df tg Geometrie Planimetrie Kreis. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Figur Frankfurt Main Kreise mit Innenkreisen Papier Holzschnitt cm Geometrie Planimetrie Kreis ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte Jh Verwalter Dresden