Assertion: headlight's bulb | /r/HasAspect | only one filament
Facets:
value: inside
type: LOCATION
Source sentences:
text: These are known as single filament bulbs, because each bulb has only one filament inside.
text: 1933–1934 Packards featured tri-beam headlamps, the bulbs having three filaments.
text: Some bulbs have only one filament, but others have two.