Assertion: wearable hearing aid | /r/CapableOf | go on sale
Facets:
value: in 1936
type: TEMPORAL
value: in the united states
type: LOCATION
value: a year later
type: TEMPORAL
value: in england
type: LOCATION
Source sentences:
text: The first wearable hearing aid using vacuum tube technology went on sale in England in 1936, and a year later in the United States.