Assertion: rotor kite | /r/HasProperty | developed as recreational aircraft
Facets:
value: during the 1950s
type: TEMPORAL
Source sentences:
text: During the 1950s, rotor kites were developed as recreational aircraft, largely due to the efforts of Dr. Igor Bensen in the United States, whose Bensen Aircraft Corporation produced a series of such aircraft, dubbed "gyrogliders" by Bensen.