Assertion: trombone | /r/MadeOf | valve
Facets:
value: from the 19th century
type: TEMPORAL
Source sentences:
text: From the 19th century, some trombones have been made with valves, but their use was never universal.
text: Trombones are made without the valve, but most trombone players play a slide trombone.
text: From the 19th century, some trombones have been made with valves, but their use was never universal.