Assertion: phosphine | /r/HasAspect | a 100-year of history of use
Facets:
value: nearly
type: DEGREE
value: as a fumigant
type: PURPOSE
Source sentences:
text: Phosphine has had a nearly 100-year of history of use as a fumigant after it was first described chemically by Philippe Gengembre in 1783 as a product of heating elemental phosphorus in a solution of potassium carbonate (40).