Assertion: lamp | /r/HasAspect | base
Facets:
value: with alignment features
type: OTHER
value: usually
type: TEMPORAL
Source sentences:
text: Lamps usually have a base made of ceramic, metal, glass, or plastic, which secures the lamp in the socket of a light fixture.
text: Lamps intended for use in optical systems have bases with alignment features so that the filament is positioned accurately within the optical system.