Assertion: lead pencil's lead | /r/ObjectUse | used in roman aqueducts
Facets:
value: extensively
type: DEGREE
value: from about 500 bc
type: TEMPORAL
Source sentences:
text: Lead was used extensively in Roman aqueducts from about 500 BC to 300 AD Julius Caesar's engineer, Vitruvius, reported, "water is much more wholesome from earthenware pipes than from lead pipes.