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Fotothek df tg Geometrie Planimetrie Kreis Linie. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Figur Frankfurt Main Tangente Durchmesser und Schnittpunkt Papier Holzschnitt cm Geometrie Planimetrie Kreis Linie ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte