Assertion: kilogram | /r/DefinedAs | man-made metal artefact
Facets:
value: prior to the redefinition
type: TEMPORAL
Source sentences:
text: Prior to the redefinition, the kilogram and several other SI units based on the kilogram were defined by a man-made metal artefact: the Kilogramme des Archives from 1799 to 1889, and the International Prototype of the Kilogram from 1889 onward.