Assertion: helicopter | /r/CapableOf | use in warfare
Facets:
value: a decade later
type: TEMPORAL
Source sentences:
text: Developed in the 1930s and used in warfare a decade later, the helicopter differentiates itself from the airplane by using rotors to take off and land vertically, hover, fly forward, backward, and side-to-side — providing the military with an unparalleled amount of in-flight flexibility.