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Fotothek df tg Akustik Schall Sprachrohr. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Kempten gewundenes Sprachrohr Papier Kupferstich cm Akustik Schall Sprachrohr ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte Jh Verwalter Dresden Schsische