Assertion: thames barrier | /r/CapableOf | become operational
Facets:
value: in 1982
type: TEMPORAL
Source sentences:
text: The Thames Barrier has been closed 174 times since it first became operational in 1982 (correct as of March 2014).
text: The Thames Barrier has been closed 186 times since it became operational in 1982 (correct as of October 2019).