I am wondering where was helicopter invented?
Igor Sikorski invented the first practical flying helicopter.
Igor Sikorski, a Russian born American, invented the first practical helicopter.
Nobody invented the helicopter in 1918
An engineer, Igor Sikorski, invented the helicopter.
No African American invented the helicopter. The first practical helicopter was invented by Igor Sikorski, a Russian American.
Igor Sikorsky invented the first practical helicopter around 1940
Igor Sikorsky invented the helicopter.
no
J. T awston invented the helicopter (black male)
The Huey (UH-1, originally HU-1 [hence the "Huey" name]) helicopter is designed and built by the Bell Aircraft Corporation which is now called Bell Helicopter Textron.
That is Igor Sikorski, and he was in his 40 's when he invented the first practical helicopter.
The first practical helicopter was invented about 1942