| 1942 DI Variable Pitch Propeller Patent Print |
| 1942 LAMPTON Controllable Pitch Propeller Patent |
| 1942 COLLEY Variable Pitch Propeller Control Art |
| 1942 CURT Variable Pitch Propeller Patent Print |
| 1942 GODFREY Adjustable Pitch Propeller Patent |
| 1942 LAMPTON Controllqable Pitch Propeller Art |
| 1942 MERICKLE Variable Pitch Propeller Patent |
| 1942 FIKE Variable Pitch Propeller Patent Print |
| 1942 ROLAND Controllable Pitch Propeller Patent |
| 1942 DI Variable Pitch Propeller Hub Construction |
| 1942 MOORE Changeable Pitch Propeller Unit Art |
| 1942 DEHAVILLAND AIRCRAFT Variable Pitch Propeller |
| 1942 METCALF Variable Pitch Propeller Patent |
| 1942 AVIAT CORP Controllable Pitch Propeller Art |
| 1942 AVIAT CORP Controllqable Pitch Propeller |
| 1942 EMMONS Controllable Pitch Propeller Patent |
| 1942 CURT Controllable Pitch Propeller Patent |
| 1942 HANS Variable Pitch Propeller Aircraft Art |
| 1942 ROBY INC Variable Pitch Propeller Patent |
| 1942 HAMMOND JR Variable Pitch Propeller Control |
| 1942 ERIC Controllable Pitch Propeller Patent |
| 1942 ROBY Variable Pitch Propeller Patent Print |