Category:Ertel-Werk
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Deutsch: Das 1802 gegründete Ertel-Werk für Feinmechanik ...
Media in category "Ertel-Werk"
The following 4 files are in this category, out of 4 total.
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Meridiankreis-Instrument.JPG 5,152 × 3,864; 6.56 MB
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Museo della Specola di Bologna abc11 - teodolite ripetitore Ertel & Sohn.jpg 3,094 × 3,685; 5.44 MB