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