Assertion: transistor radio | /r/HasProperty | superseded by the sony walkman
Facets:
value: beginning around 1980
type: TEMPORAL
Source sentences:
text: Beginning around 1980, however, cheap AM transistor radios were superseded initially by the boombox and the Sony Walkman, and later on by devices with higher audio quality such as portable CD players, personal audio players, MP3 players and (eventually) by smartphones, many of which contain FM radios themselves.