Assertion: diver's fin | /r/CapableOf | become popular
Facets:
value: for lap swimming
type: PURPOSE
value: by 1990
type: TEMPORAL
Source sentences:
text: By 1990, ready-made short-bladed fins such as Marty Hull's "Zoomers" and cut-down longer-bladed fins became popular for lap swimming as swim workouts grew to be more nuanced and less regimented.