Assertion: chlorofluorocarbon | /r/HasProperty | developed in 1930
Facets:
value: as the “perfect” refrigerant
type: MANNER
Source sentences:
text: Chlorofluorocarbons were developed in the 1930s and are now the main cause of ozone depletion.
text: These CFCs, usually referred to by their brand name Freon, were developed in the 1930s as the “perfect” refrigerant because they are efficient, non-toxic and non-reactive.
text: Chlorofluorocarbons (CFCs) were developed in the 1930s.