Assertion: pilotless aircraft | /r/HasProperty | built
Facets:
value: after i. leading
type: OTHER
Source sentences:
text: The first pilotless aircraft were built during and shortly after World War I. Leading the way, using A. M. Low's radio control techniques, was the Ruston Proctor Aerial Target of 1916.
text: The first pilotless aircraft were built during and shortly after World War I. Leading the way, using A. M. Low's radio control techniques, was the "Aerial Target" of 1916.