Assertion: airplane | /r/CapableOf | see rapid development
Facets:
value: in the second world war
type: TEMPORAL
Source sentences:
text: Not only airplanes, but also helicopters saw rapid development in the Second World War, with the introduction of the Focke Achgelis Fa 223, the Flettner Fl 282 synchropter in 1941 in Germany and the Sikorsky R-4 in 1942 in the USA.