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usa
Igor Sikorsky invented the first practical helicopter.
Nobody invented the helicopter in 1909
Sir Edmund pierce Jacquier first invented the single rotor helicopter in the year 1989.
united states
Igor Sikorsky invented the first practical helicopter around 1940
No African American invented the helicopter. The first practical helicopter was invented by Igor Sikorski, a Russian American.
Igor Sikorski invented the first practical flying helicopter.
usa
The first practical helicopter was invented about 1942
The helicopter was first used as a troop transport.
Igor Sikorsky invented the first practical helicopter
That is Igor Sikorski, and he was in his 40 's when he invented the first practical helicopter.
Igor Sikorski, a Russian born American, invented the first practical helicopter.
to fly
no
Russia