Assertion: mustard gas | /r/HasProperty | synthesized by frederick guthrie
Facets:
value: in 1860
type: TEMPORAL
Source sentences:
text: Sulfur mustard (in its form mustard gas) was synthesized by Frederick Guthrie in 1860.
text: Sulfur mustard (in its form mustard gas) was synthesized by Frederick Guthrie in 1860.