ventilation level

adit for air ventilation in a mine

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Wikidata
air level; ventilation road
level, underground mine ventilation, 
intake level, level, return air level, 

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Location: KML, Cluster Map, Maps,

Type	Subtype	Date	Description	Notes	Source
classes	subterranea		intake level	ventilation level	Wikidata
classes	subterranea		return air level	ventilation level	Wikidata