Assertion: toy helicopter | /r/HasProperty | presented to the french academy of science
Facets:
value: by two artisans
type: OTHER
value: in 1784
type: TEMPORAL
Source sentences:
text: A toy helicopter, using rotors made out of the feathers of birds, was presented to the French Academy of Science in 1784 by two artisans, Launoy and Bienvenu; this toy forecast a more successful model created in 1870 by Alphonse Pénaud in France.