| 1931 WHITLOCK Propeller Patent Print Art |
| 1931 HALVORSEN Screw Propeller Patent Print Art |
| 1931 SCHLEEDE Propeller Patent Print Art |
| 1931 MENITOR AB Propeller Patent Print Art |
| 1931 DAVENPORT Propeller Patent Print Art |
| 1931 DAVENPORT FREDERICK Propeller Patent Print |
| 1931 WILSON Adjustable Propeller Patent Print |
| 1931 MAISON EDMUND Propeller Patent Print Art |
| 1931 JOZEF BAGEL Propeller Patent Print Art |
| 1931 RANDALL JAMES Propeller Patent Print Art |
| 1931 HALVORSEN OLE Screw Propeller Patent Print |
| 1931 MILLER WILLMAN Propeller Patent Print Art |
| 1931 DORRIS Propeller For Swimmers Patent Print |
| 1931 RANDALL Propeller Patent Print Art |
| 1931 MAISON Propeller Patent Print Art |
| 1931 HANS Propeller Of A Vessel Patent Print Art |
| 1931 SCHLEEDE HERMANN Propeller Patent Print Art |
| 1931 DE POLO Propeller Patent Print Art |
| 1931 REMUS KOENIG Propeller Patent Print Art |
| 1931 WHITLOCK JOHN Propeller Patent Print Art |
| 1931 MILLER Propeller Patent Print Art |
| 1931 SAN CARLOS Propeller Patent Print Art |
| 1931 SVENDSEN Propeller Mounting Patent Print |