| 1938 CRUMBACK SYLVESTER Propeller Patent Print |
| 1938 IRGENS FINN Propeller Mounting Patent Print |
| 1938 JUUL Propeller For Aircraft Patent Print |
| 1938 HACKETHAL PAUL Propeller Patent Print Art |
| 1938 BERLINER HENRY Propeller Patent Print Art |
| 1938 MUNK Thrust Relieved Propeller Patent Print |
| 1938 LAMPTON GLEN Propeller Blade Patent Print |
| 1938 STONE Propeller Construction Patent Print |
| 1938 EVERTS Adjustable Propeller Patent Print |
| 1938 TYLER Flexible Propeller Spider Patent |
| 1938 JOHN W ROXBOROUGH Propeller Patent Print |
| 1938 BENDIX PROD CORP Propeller Patent Print Art |
| 1938 THEODORE KELLEWEAY Propeller Patent Print |
| 1938 EDWARD DROULLARD Propeller Patent Print Art |
| 1938 PETER Reversible Propeller Patent Print Art |
| 1938 DESCHAMPS Propeller Shaft Mounting Patent |
| 1938 EVEREL PRODUCTS CORP Propeller Patent Print |
| 1938 PALMER Controllable Pitch Propeller Patent |
| 1938 BENSON Propeller Guard Patent Print Art |
| 1938 PRESTON Controllable Pitch Propeller Patent |
| 1938 FINLEY Propeller Driven Vehicle Patent |
| 1938 BENSON JOHN Propeller Guard Patent Print |
| 1938 JOHN SQUIRES Automatic Propeller Patent |
| 1938 UNITED AIRCRAFT CORP Propeller Patent Print |
| 1938 HARNETT MCLEOD Screw Propeller Patent Print |
| 1938 REID Variable Pitch Propeller Patent Print |
| 1938 GUSTAV FEIGE Propeller Patent Print Art |
| 1938 MICHAEL Airplane Propeller Patent Print Art |
| 1938 AVIAT MFG CORP Propeller Patent Print Art |
| 1938 ERLE Aeronautical Propeller Patent Print |
| 1938 EVERTS Variable Pitch Propeller Patent |
| 1938 WILLIAM Propeller Governor Patent Print Art |
| 1938 AVIAT MFG CORP Propeller Blade Patent Print |
| 1938 SMITH Variable Pitch Propeller Patent Print |
| 1938 EVERTS WALTER Propeller Patent Print Art |
| 1938 WISE Outboard Motor Propeller Guard Patent |
| 1938 THOMPSON MILTON Propeller Patent Print Art |
| 1938 ODOR Propeller Assembly For Aircraft Patent |
| 1938 BLAIR Propeller Patent Print Art |
| 1938 LAWRENCE C LAKE Airplane Propeller Patent |
| 1938 HAVILL CLINTON Propeller Patent Print Art |
| 1938 MILES LOREN Aircraft Propeller Patent Print |
| 1938 OCKER Hinged Propeller Blade Patent Print |
| 1938 EDWARD Propeller Patent Print Art |
| 1938 THOMPSON Propeller Patent Print Art |
| 1938 WEICHWALD Novel Efficient Propeller Patent 19259 |
| 1938 MCNEAL ELLIS Propeller Patent Print Art |
| 1938 AUSTIN ELLSWORTH Propeller Patent Print Art |
| 1938 PERCY CABLE Aeroplane Propeller Patent |
| 1938 THEODORE Propeller Patent Print Art |
| 1938 BRUNO Variable Pitch Propeller Patent Print |
| 1938 ECLIPSE AVIAT CORP Propeller Patent Print |
| 1938 LANSING RAYMOND Propeller Patent Print Art |
| 1938 SHACKELFORD MARSHAL Propeller Patent Print |
| 1938 HARNETT Screw Propeller Patent Print Art |
| 1938 JOHN WEICHWALD Propeller Patent Print Art |
| 1938 DICKS THOMAS Propeller Blade Patent Print |