| 1940 LORENZEN ROGER Propeller Patent Print Art |
| 1940 HAVILL Propeller Pitch Indicator Patent |
| 1940 LUDWIG Propeller For Aircraft Patent Print |
| 1940 CURTISS WRIGHT CORP Propeller Blade Patent |
| 1940 JAN Rotary Propeller Art Print Patent |
| 1940 FRANZ Arrangement Driving Propeller An Aircraft |
| 1940 CORSON WILLIAM Propeller Patent Print Art |
| 1940 TABER Variable Pitch Airplane Propeller Art |
| 1940 CARL Adjustable Screw Propeller Patent |
| 1940 WISTE OLAV Propeller Patent Print Art |
| 1940 PORTER LANDRUM Aircraft Propeller Patent |
| 1940 VICTOR Air Propeller Blade Material Making Same |
| 1940 SCHMIDT Airplane Propeller Patent Print Art |
| 1940 ECLIPSE AVIAT INC Propeller Control Mechanism |
| 1940 FISCHER Propeller Ornamental Design Patent 19266 |
| 1940 UNITED AIRERAFT CORP Propeller Control Means |
| 1940 DRIGGS Variable Pitch Propeller Patent |
| 1940 OBY Variable Pitch Propeller Patent Print |
| 1940 STROOMLYN TOT EXPLOITATIE VAN Rotary Propeller |
| 1940 FRANCESCO Propeller Device Patent Print Art |
| 1940 DORNER Collapsible Propeller Airplanes Art |
| 1940 BARTON WILLIAMS Propeller Patent Print Art |
| 1940 ENGINEERING RES CORP Variable Pitch Propeller |
| 1940 FARRELL Variable Pitch Propeller Patent |
| 1940 HAMMOND Variable Pitch Propeller Control |
| 1940 GIANNI Coaxial Propeller Drive Patent Print |
| 1940 ERLE Propeller Balancing Means Patent Print |
| 1940 GLENN L MARTIN CO Variable Pitch Propeller |
| 1940 MACNEIL Propeller Control Mechanism Patent |
| 1940 REINNARD Propeller Connection Control Art |
| 1940 ECLIPSE AVIAT CORP Propeller Pitch Indicator |
| 1940 BRINER Propeller Control Mechanism Patent |
| 1940 ALBERT Blade Wheel Propeller Patent Print |
| 1940 RUSSELL RICHARDSON Propeller Blade Patent |
| 1940 JOHNSON Airplane Propeller Driving Mechanism |
| 1940 RUTHS Variable Pitch Propeller Patent Print |
| 1940 HUBERT Cooling Propeller Shaft Sterntube Bearings |
| 1940 WERNER Screw Propeller Patent Print Art |
| 1940 FAHRNEY Wire Propeller Blade Patent Print |
| 1940 RASK GILBERT Propeller Patent Print Art |
| 1940 EUGENE Engine And Propeller Patent Print |
| 1940 EGAN Propeller Driving Mechanism Patent |
| 1940 OTTO Screw Propeller Art |
| 1940 OTTO BROCKHAUS Screw Propeller Patent Print |
| 1940 KNAPP MONARCH CO Propeller Patent Print Art |
| 1940 EUGENE NEWNHAM Propeller Patent Print Art |
| 1940 KELLY WILLIAM Airplane Propeller Patent |
| 1940 KOCH Propeller Connection Control Art Print |
| 1940 WERNER BAUMANN Screw Propeller Patent Print |
| 1940 BERTRAN Variable Pitch Propeller Patent |
| 1940 PETER KESSERY Propeller Patent Print Art |
| 1940 GOODMAN Aircraft Propeller Drive Patent |
| 1940 UNITED AIRCRAFT CORP Propeller Balancing Means |
| 1940 ERIE Propeller Control Means Patent Print |
| 1940 VANETTA EDWARD Propeller Patent Print Art |