Assertion: liquid carbon dioxide | /r/ObjectUse | used as refrigerant
Facets:
value: prior to the discovery
type: TEMPORAL
Source sentences:
text: Liquid carbon dioxide (industry nomenclature R744 or R-744) was used as a refrigerant prior to the discovery of R-12 and may enjoy a renaissance due to the fact that R134a contributes to climate change more than CO
text: Liquid carbon dioxide (industry nomenclature R744 / R-744) was used as a refrigerant prior to the discovery of R-12.