Assertion: light bulb | /r/ObjectUse | used in outdoor lighting
Facets:
Source sentences:
text: Arc lamps (or light bulbs) were used mainly in outdoor lighting; the race was still on among a large group of scientists to discover a useful source of indoor illumination.
text: Arc lamps (or light bulbs) were used mainly in outdoor lighting; the race was still on among a large group of scientists to discover a useful source of indoor illumination.