| 1969 YUAN SHAO High Speed Rotor Patent Print Art |
| 1969 MACKENZIE NEIL Rotor Mounting Patent Print |
| 1969 BELL AEROSPACE CORP Rotor Mounting Patent |
| 1969 CURE Rotor Heads Rotary Wing Aircraft Art |
| 1969 STONE Helicopter Rotor Transmission System |
| 1969 UNITED AIRCRAFT CORP Rotor Blade Pitch Lock |
| 1969 VACCA Rotor Blade Pitch Lock Patent Print |
| 1969 PAINE Prop Rotor Pylon Stabilization Means |
| 1969 WEILAND Helicopter Rotor Construction Art |
| 1969 VACCA Helicopter Rotor With Foldable Blade |
| 1969 BELL AEROSPACE CORP Focus Rotor Stabilization |
| 1969 SAWICKI Focus Rotor Stabilization Patent |
| 1969 SPIVEY RICHARD Rotor Blade Patent Print Art |
| 1969 BELL AEROSPACE CORP Rotor Blade Patent |
| 1969 RODRIGUEZ Rotor Blade Grip Bearing Patent |
| 1969 BOLKOW GMBH Helicopter Rotor Construction |
| 1969 BELL AEROSPACE CORP Rotor Blade Grip Bearing |
| 1969 FERRIS Helicopter Rotor Stack Bearing Art |
| 1969 YUAN SHAO WEN High Speed Rotor Patent Print |
| 1969 BOLKOW GMBH Rotor Blade Construction Patent |
| 1969 BRUNSCH Rotor Blade Construction Patent |