Assertion: calcium carbide | /r/ObjectUse | used by mining industries
Facets:
value: in some nations
type: LOCATION
value: without workplace safety laws
type: OTHER
Source sentences:
text: It was used for miners and cavers before the widespread use of incandescent lighting; or many years later low-power/high-lumen LED lighting; and is still used by mining industries in some nations without workplace safety laws.