Assertion: potassium nitrate | /r/HasProperty | employed by doctor
Facets:
value: to treat such varied problems
type: PURPOSE
value: during the 18th century
type: TEMPORAL
Source sentences:
text: It and other nitrates were employed by doctors during the 18th century to treat such varied problems as asthma, sore throats, and arthritis.
text: It and other nitrates were employed by doctors during the 18th century to treat such varied problems as asthma, sore throats, and arthritis.