Assertion: lamp | /r/ObjectUse | used using color signals
Facets:
value: most commonly
type: DEGREE
value: for clearance
type: PURPOSE
value: in airport control towers
type: LOCATION
value: on naval vessels
type: LOCATION
value: for stop
type: PURPOSE
Source sentences:
text: The lamps were usually equipped with some form of optical sight, and were most commonly used on naval vessels and in airport control towers (using color signals for stop or clearance).