Assertion: underground ventilation | /r/HasProperty | metalliferrous mines
Facets:
Source sentences:
text: Underground ventilation (metalliferrous mines)
text: Kb Underground ventilation (metalliferrous mines)
text: Underground ventilation (metalliferrous mines)
text: Kb Underground ventilation (metalliferrous mines)
text: Underground ventilation (metalliferrous mines)
text: Kb Underground ventilation (metalliferrous mines)