Assertion: led | /r/ObjectUse | used in light-signaling devices
Facets:
value: for information boards
type: PURPOSE
value: for quite a long time
type: TEMPORAL
value: for signs
type: PURPOSE
value: for etc
type: PURPOSE
Source sentences:
text: For quite a long time, LEDs have been used in light-signaling devices for the road and railway traffic lights, information boards, signs, etc.