Assertion: television broadcasting | /r/CapableOf | become widespread
Facets:
value: in the 1950s
type: TEMPORAL
value: after world war ii
type: TEMPORAL
Source sentences:
text: Television broadcasting started experimentally in the 1920s and became widespread after World War II, using VHF and UHF spectrum.
text: AM radio remained the dominant method of broadcasting for the next 30 years, a period called the "Golden Age of Radio", until television broadcasting became widespread in the 1950s and received most of the programming previously carried by radio.