Assertion: furnace | /r/CapableOf | use solid fuels
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Furnaces that used solid fuels required daily maintenance to remove ash and "clinkers" that accumulated in the bottom of the burner area.
text: Historically these furnaces have used solid fuel, and bituminous coal has proven to be the best choice.
text: Furnaces that used solid fuels required daily maintenance to remove ash and "clinkers" that accumulated in the bottom of the burner area.