Assertion: helicopter's rotor | /r/CapableOf | grow at lockheed california
Facets:
value: by thomas f. hanson
type: OTHER
value: out of work
type: OTHER
Source sentences:
text: The Hanson Elastic Articulated (EA) bearingless rotor grew out of work done in the early 1960s at Lockheed California by Thomas F. Hanson, who had previously worked at Convertawings on the quadrotor's rotor design and control system.