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Fotothek df tg Mechanik Instrument Vermessung Strecke. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Figur Frankfurt Main Gebrauch des Wegzhlers Papier Kupferstich cm Mechanik Instrument Vermessung Strecke ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte Jh