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Hand-operated fans to force ventilation in mine tunnels, engraving from De Re Metallica (On the Nature of Metals), by Georg Agricola, published in Basel in 1561
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Amazon.com: Mine Ventilation System Noperated By Horse And Manpower Woodcut From Georgius AgricolaS Treatise De Re Metallica 1556 Poster Print by (18 x 24): Posters & Prints
Image of MINE VENTILATION SYSTEM. System Operated By Horse And Manpower. Woodcut From Georgius Agricola's Treatise 'De Re Metallica', 1556. From Granger - Historical Picture Archive
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SciELO - Brazil - Strategies used to control the costs of underground ventilation in some Brazilian mines Strategies used to control the costs of underground ventilation in some Brazilian mines
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Tunnel De Ventilation De Mine De Charbon Abandonné Rétro Tonique, Arrière-plan Industriel. Banque D'Images Et Photos Libres De Droits. Image 61499675.
Revolving wooden wind vanes fitted to the top of mine ventilation shafts. When they revolved they acted as extractor fans sucking stale air from the mine. From De re metallica, by Agricola,
