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Fotothek df tg Mechanik Musikinstrument Wasserorgel Tremulant. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Frankfurt Main Tremulant Papier Holzschnitt cm Mechanik Musikinstrument Wasserorgel Tremulant ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte