Assertion: open rotor | /r/CapableOf | become with contra-rotating open rotor
Facets:
value: by the 2000s
type: TEMPORAL
Source sentences:
text: By the 2000s, open rotor (OR) became a preferred term for propfan technology in research and news reports, with contra-rotating open rotor (CROR) also occasionally being used to distinguish between single-rotation propfans.