Assertion: blast furnace | /r/ObjectUse | used in copper smelting
Facets:
value: rarely
type: DEGREE
value: currently
type: TEMPORAL
Source sentences:
text: Blast furnaces are currently rarely used in copper smelting, but modern lead smelting blast furnaces are much shorter than iron blast furnaces and are rectangular in shape.
text: Blast furnaces are currently rarely used in copper smelting, but modern lead smelting blast furnaces are much shorter than iron blast furnaces and are rectangular in shape.