| 1950 EVEREL PROPELLER CORP Propeller Hub Patent |
| 1950 GEN MOTORS CORP Propeller Control Patent |
| 1950 SPEIR Propeller Blade Deicing Shoe Patent |
| 1950 GEN MOTORS CORP Aircraft Propeller Patent |
| 1950 NICHOLS Controllable Pitch Marine Propeller System |
| 1950 GEN MOTORS CORP Dual Rotation Propeller Art |
| 1950 GUSTAV Propeller Blades Patent Print Art |
| 1950 GLASS RICHARD Propeller Patent Print Art |
| 1950 ERNEST Propeller Blade Retention Patent |
| 1950 CURTISS WRIGHT CORP Variable Pitch Propeller |
| 1950 EARL Side Steering Propeller Patent Print |
| 1950 JENNY Constant Speed Propeller Patent Print |
| 1950 CURTISS WRIGHT CORP Constant Speed Propeller |
| 1950 DEAN Blade Seal Propeller Spinners Art |
| 1950 BLOOMFIELD Aircraft Propeller Drive Patent |
| 1950 MAY Fluid Controlled Propeller Patent Print |
| 1950 LOCKHEED AIRCRAFT CORP Aircraft Propeller Drive |
| 1950 ROTOL LTD Screw Propeller Patent Print Art |
| 1950 PETERSEN Feathering Reversible Propeller |
| 1950 FROOM Attaching Propeller Spinners Art |
| 1950 ROWLEY Diver'S Patch Propeller Shafts Art |
| 1950 TROLLER Variable Pitch Propeller Patent |
| 1950 ROUSE EDWARD Propeller Patent Print Art |
| 1950 MARTIN THOMAS Aircraft Propeller Patent |
| 1950 BUCHER Blade Construction Propeller Blade |
| 1950 FIGLEY KENNCTH Aircraft Propeller Patent |
| 1950 GEYER HOWARD Propeller Control Patent Print |
| 1950 JOY MFG CO Variable Pitch Propeller Patent |
| 1950 WILLIS Controllable Pitch Propeller Patent |
| 1950 MILLER Variable Pitch Propeller Patent |
| 1950 HACKETHAL PAUL Propeller Hub Patent Print |
| 1950 CURTISS WRIGHT CORP Compound Propeller Blade |
| 1950 GRUETJEN Balance Assembly Propeller Blades |
| 1950 EARL Reversible Propeller Patent Print Art |
| 1950 MARTIN Dual Rotation Propeller Patent Print |
| 1950 ROWLEY ELTON Folding Propeller Patent Print |
| 1950 ROMAN Differential Propeller Control Patent |
| 1950 EARL BELL Reversible Propeller Patent Print |
| 1950 ERIC Propeller Pitch Control Means Patent |
| 1950 ENGELKE Propeller Ornamental Design Patent 19302 |
| 1950 GRIESE Compound Propeller Blade Patent |
| 1950 THOMPSON Marine Propeller Patent Print Art |
| 1950 HANSEN OLE Marine Propeller Patent Print |
| 1950 WOLF Feathering Propeller Hub Coupling Art |
| 1950 GEN MOTORS CORP Fluid Controlled Propeller |
| 1950 GUSTAV MEIER Propeller Blades Patent Print |
| 1950 HANSEN Marine Propeller Patent Print Art |
| 1950 THOMPSON JR Marine Propeller Patent Print |
| 1950 SMITH Boat Having A Buoyant Propeller |
| 1950 EDWARD GODDEN Screw Propeller Patent Print |
| 1950 WANZER Outboard Propeller Mechanism Boats |
| 1950 CHILLSON Propeller Blade Antiicing Means |
| 1950 WEBER Constant Speed Propeller Patent Print |
| 1950 EAVES Controllable Pitch Propeller Patent |
| 1950 CUSHMAN Variable Pitch Propeller Patent |