Assertion: vacuum | /r/CapableOf | remain for many years
Facets:
value: after their introduction
type: TEMPORAL
Source sentences:
text: For many years after their introduction, vacuum cleaners remained a luxury item, but after the Second World War, they became common among the middle classes.
text: For many years after their introduction, vacuum cleaners remained a luxury item, but after the Second World War, they became common among the middle classes.