Assertion: blimp | /r/ObjectUse | used by navy
Facets:
value: in convoy
type: LOCATION
value: in antisubmarine patrol duty
type: TEMPORAL
value: during world war i
type: TEMPORAL
Source sentences:
text: Blimps were used by navies during World War I in convoy and antisubmarine patrol duty, became attractions at fairs and expositions, and later carried advertising messages.