Assertion: rudder | /r/HasProperty | invented
Facets:
value: previously
type: TEMPORAL
Source sentences:
text: In 1906 the Wright brothers obtained a patent not for the invention of an airplane (which had existed for a number of decades in the form of gliders) but for the invention of a system of aerodynamic control that manipulated a flying machine's surfaces, including lateral flight control, although rudders, elevators and ailerons had previously been invented.