| 1950 GUSTAV Propeller Blades Patent Print Art |
| 1950 GLASS RICHARD Propeller Patent Print Art |
| 1950 EARL Side Steering Propeller Patent Print |
| 1950 JENNY Constant Speed Propeller Patent Print |
| 1950 MAY Fluid Controlled Propeller Patent Print |
| 1950 ROTOL LTD Screw Propeller Patent Print Art |
| 1950 ROUSE EDWARD Propeller Patent Print Art |
| 1950 GEYER HOWARD Propeller Control Patent Print |
| 1950 HACKETHAL PAUL Propeller Hub Patent Print |
| 1950 EARL Reversible Propeller Patent Print Art |
| 1950 MARTIN Dual Rotation Propeller Patent Print |
| 1950 ROWLEY ELTON Folding Propeller Patent Print |
| 1950 EARL BELL Reversible Propeller Patent Print |
| 1950 THOMPSON Marine Propeller Patent Print Art |
| 1950 HANSEN OLE Marine Propeller Patent Print |
| 1950 GUSTAV MEIER Propeller Blades Patent Print |
| 1950 HANSEN Marine Propeller Patent Print Art |
| 1950 THOMPSON JR Marine Propeller Patent Print |
| 1950 EDWARD GODDEN Screw Propeller Patent Print |
| 1950 WEBER Constant Speed Propeller Patent Print |