Assertion: phosgene | /r/CapableOf | use at ypres
Facets:
value: probably
type: DEGREE
value: in december
type: TEMPORAL
value: by the germans
type: OTHER
Source sentences:
text: Phosgene (carbonyl dichloride) was Haber’s next choice, probably used first at Ypres by the Germans in December 1915.