| 1920 NAVARRE Safety Device For Aviators Patent |
| 1920 YUSKE Locking Device For Levers Patent |
| 1920 ROSE Retaining Device For Switch Points Art |
| 1920 CHARLES Safety Device For Cars Patent Print |
| 1920 VICKERS LTD Sighting Device For Guns Patent |
| 1920 GAETAN Safety Device For Aircraft Patent |
| 1920 MAXWELL Device For Teaching Music Patent |
| 1920 EUGENE Sighting Device For Guns Patent |
| 1920 MAGUIRE Invalid Self Feeding Device Patent 9249 |
| 1920 LOUIS Safety Device For Point Switches Art |
| 1920 MARTIN Landing Device For Aeroplanes Patent |
| 1920 WEBER Oiling Device For Journal Boxes Art |
| 1920 PETER Device For Raising Sunken Ships |
| 1920 HISKIAS Tension Device Protector Patent |
| 1920 SIMON Illusion Device Design Patent 9745 |
| 1920 VERDON Landing Device For Aircraft Patent |
| 1920 READ Locking Device For Automobiles Patent |
| 1920 RASSMANN Watering Device For Cattle Patent |
| 1920 RIGBY Locking Device Transportation Patent 22122 |
| 1920 TREVOR Sighting Device For Guns Patent |