| 1920 SALVATORE Marine Propeller Patent Print Art |
| 1920 ALFRED Propeller Mud Guard Aeroplanes Art |
| 1920 ESERCIZIO BACINI SOC Marine Propeller |
| 1920 LEE CHARLES Fan Propeller &C Patent Print |
| 1920 EUGENE Variable Pitch Propeller Patent |
| 1920 ST JOHN Rubber Propeller Patent Print Art |
| 1920 SHERWOOD Duplex Propeller Patent Print Art |
| 1920 GALLAGHER FRANK Propeller Patent Print Art |
| 1920 BRUNO SCHMELZER Propeller Patent Print Art |
| 1920 LA FLEUR Propeller Patent Print Art |
| 1920 SIMONS Wing Propeller For Aircraft Patent |
| 1920 WICKER Aeroplane Propeller Blade Patent |
| 1920 FLATTUM ALBERT Aerial Propeller Patent |
| 1920 PITTSBURGH AEROPLANE MOTOR C Propeller Art |
| 1920 EDWARD Marine Propeller Patent Print Art |
| 1920 SANFORD CHARLES Propeller Patent Print Art |
| 1920 LEINWEBER VICTOR Propeller Blade Patent |
| 1920 SPERRY Twin Propeller Aeroplane Patent |
| 1920 STRONG Air Machine And Propeller Patent |
| 1920 THOMAS LEWIS DAVIES Propeller Operation In Air |
| 1920 YOUNGQUIST Propeller Art |
| 1920 SHERWOOD STARR Duplex Propeller Patent |
| 1920 PRATT ROBERT Propeller Patent Print Art |
| 1920 HERMANN Propeller Or The Like Patent Print |
| 1920 MOTT SAMUEL Aeroplane Propeller Patent |
| 1920 SHAFFER Aeroplane Propeller Patent Print |
| 1920 CONTINENTAL AIR CRAFT TRANSP Propeller Blade |
| 1920 BOEHM VALTIN Propeller Patent Print Art |
| 1920 PEOPLES Adjusting Mechanism Propeller Blades |
| 1920 ARTHUR B SULLIVAN Aeroplane Propeller Art |
| 1920 HENRY LEITNER Screw Propeller Patent Print |
| 1920 DAVEY ODDY Propeller Patent Print Art |
| 1920 HOWARD Variable Pitch Propeller Patent |
| 1920 WINDSOR Propeller Operation In Air Art |
| 1920 MUSANTE JOHN Propeller Patent Print Art |
| 1920 SPENCER Protector Propeller Blades Art |
| 1920 FRANK FOLEY Propeller Patent Print Art |
| 1920 HALL ELBERT Propeller Mounting Patent Print |
| 1920 BELDIN Adjustable Propeller Patent Print |
| 1920 GALLAGHER Propeller Patent Print Art |
| 1920 HERMANN FAEHRMANN Propeller Patent Print |
| 1920 SUMMERS Aeroplane Propeller Patent Print |
| 1920 LYONS ARTHUR Reversing Propeller Patent |
| 1920 EDWARD SIEVART Marine Propeller Patent |
| 1920 EDWARD Aeroplane Propeller Patent Print Art |
| 1920 LEE Fan Propeller &C Art |
| 1920 VLADIMIR OLHOVSKY Propeller Patent Print |