Nobody invented the helicopter in 1918
Igor Sikorsky invented the helicopter.
no
Igor Sikorski invented helicopter in the year 1906.
No. The submarine came about long before the helicopter.
no they have not
Nothing's changed
I am wondering where was helicopter invented?
Nobody invented the helicopter in 1918
I have
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.
blue ray
Igor Sikorsky invented the first practical helicopter around 1940
Igor Sikorsky invented the helicopter.
no
Igor Sikorski invented the first practical flying helicopter.