Assertion: pure boron | /r/CreatedBy | american chemist
Facets:
value: in 1909
type: TEMPORAL
value: arguably first
type: DEGREE
Source sentences:
text: Pure boron was arguably first produced by the American chemist Ezekiel Weintraub in 1909.
text: The first pure boron was produced by the American chemist W. Weintraub in 1909.
text: The first pure boron was produced by the American chemist W. Weintraub in 1909.
text: Pure boron was produced by the American chemist Ezekiel Weintraub in 1909.