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Fotothek df tg Naturwissenschaft Hren Schallwelle Reflexion Instrument. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Seite Nrnberg Hrrohr Papier Holzschnitt cm Naturwissenschaft Hren Schallwelle Reflexion Instrument ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt