|
GB809947A
|
|
Improvements in or relating to helicopters
|
|
GB806614A
|
|
Improvements in or relating to aircraft provided with lifting rotors
|
|
GB780754A
|
|
Improvements in or relating to lifting rotors flying machines
|
|
GB770874A
|
|
Improvements in or relating to convertiplanes
|
|
GB752069A
|
|
Improvements in or relating to aerodynes
|
|
GB751977A
|
|
Improvements in or relating to aerodynes
|
|
GB770875A
|
|
Improvements in or relating to helicopters
|
|
GB770873A
|
|
Improvements in or relating to propulsive rotors
|
|
GB722228A
|
|
Improvements in or relating to flying machines
|
|
GB715880A
|
|
Hydrofoil assemblies and jet propulsion means for boats
|
