Assertion: fluorine's use | /r/HasProperty | curtailed
Facets:
value: more recently
type: TEMPORAL
Source sentences:
text: At one time, fluorite was also used in the manufacture of chlorofluorocarbons (CFC’s) that were used as refrigerants and in aerosol sprays, but more recently this use has been curtailed because of concerns over the role of CFC’s in the reduction of the Earth’s ozone layer.