Surface ventilation borehole: Unterschied zwischen den Versionen
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Surface ventilation borehole are a part of the ventilation system of the mine. | Surface ventilation borehole are a part of the ventilation system of the mine. | ||
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[[Bild:F8-1_Abwetter-ueber-Abbau-2.jpg|Surface ventilation borehole with 2 vents]] | [[Bild:F8-1_Abwetter-ueber-Abbau-2.jpg|Surface ventilation borehole with 2 vents]] | ||
Version vom 9. Mai 2012, 10:18 Uhr
Surface ventilation borehole are a part of the ventilation system of the mine.
