Assertion: prototype's mass | /r/HasProperty | ratified as the kilogram
Facets:
value: formally
type: MANNER
value: in 1889
type: TEMPORAL
value: by the 1st cgpm
type: TEMPORAL
Source sentences:
text: In 1883, the mass of the IPK was found to be indistinguishable from that of the Kilogramme des Archives made eighty-four years prior, and was formally ratified as the kilogram by the 1st CGPM in 1889.