Assertion: congo rubber | /r/HasProperty | major source of rubber
Facets:
value: formerly
type: TEMPORAL
Source sentences:
text: Congo rubber, formerly a major source of rubber, came from vines in the genus Landolphia (L. kirkii, L. heudelotis, and L. owariensis).
text: Congo rubber, formerly a major source of rubber, came from vines in the genus Landolphia (L. kirkii, L. heudelotis, and L. owariensis).