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Fotothek df tg Geometrie Figur. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Tabula Figur Mmpelgart Erklrung geometrischer Prinzipien anhand geometrischer Figuren Papier Kupferstich cm Geometrie Figur ppnX Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte