Assertion: practical helicopter | /r/HasProperty | built by frenchman louis breguet
Facets:
value: in 1936
type: TEMPORAL
value: in 1935
type: TEMPORAL
value: by german henrich focke
type: OTHER
Source sentences:
text: The first practical helicopters were built by Frenchman Louis Breguet in 1935 and by German Henrich Focke in 1936.
text: The first practical helicopters were built by Frenchman Louis Breguet in 1935 and by German Henrich Focke in 1936.