Assertion: radium dial | /r/CapableOf | become popular
Facets:
value: in the 1920s
type: TEMPORAL
value: after wwi
type: TEMPORAL
Source sentences:
text: After WWI and through out the 1920s, radium dials became popular and were widely used on watches and clocks.
text: In the 1920s, radium dials became popular enough that many companies started producing them.