Assertion: technetium | /r/HasProperty | discovered in december
Facets:
value: by emilio segré
type: OTHER
value: formally
type: MANNER
value: by carlo perrier
type: OTHER
Source sentences:
text: Technetium was formally discovered in December 1936 by Carlo Perrier and Emilio Segré, who discovered Technetium-95 and Technetium-97.