Assertion: fanjet | /r/HasProperty | developed
Facets:
value: as early as 1940s
type: TEMPORAL
Source sentences:
text: Turbofans were developed as early as 1940s, but not used due to less efficiency until 1960’s when Rolls-Royce RB.80 Conway became the first production turbofan engine.
text: Turbofans were developed as early as 1940s, but not used due to less efficiency until 1960s, when Rolls-Royce RB.80 Conway became the first production turbofan engine.