Assertion: sitcom | /r/HasProperty | established
Facets:
value: on radio
type: LOCATION
value: so well
type: DEGREE
value: on tv
type: LOCATION
value: before the 1950s
type: TEMPORAL
Source sentences:
text: In fact, situation comedy was so well established on radio and TV before the 1950s that it was in danger of wearing out its welcome.