Assertion: lead pencil's lead | /r/ObjectUse | used for trade
Facets:
value: with europeans
type: TRANSITIVE-OBJECT
Source sentences:
text: In Africa, lead mining and smelting were known in the Benue Trough and the lower Congo Basin, where lead was used for trade with Europeans, and as a currency by the 17th century, well before the scramble for Africa.