| 1920 NAVARRE Safety Device For Aviators Patent |
| 1920 YUSKE Locking Device For Levers Patent |
| 1920 RASSMANN Watering Device For Stock 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 FISCHER Device For Oblique Firing Patent |
| 1920 GAETAN Safety Device For Aircraft Patent |
| 1920 SCHMIDT Safety Device For Firearms Patent |
| 1920 MAXWELL Device For Teaching Music Patent |
| 1920 EUGENE Sighting Device For Guns Patent |
| 1920 GRAHAM Feeding Device For Poultry Patent |
| 1920 LOUIS Safety Device For Point Switches Art |
| 1920 MARTIN Landing Device For Aeroplanes Patent |
| 1920 WILHELM Lashing Device For Lifeboats Patent |
| 1920 EATON Feeding Device For Poultry Patent |
| 1920 WEBER Oiling Device For Journal Boxes Art |
| 1920 VOIGT Fastening Device For Lifeboats Patent |
| 1920 BADER Sighting Device For Firearms Patent |
| 1920 PETER Device For Raising Sunken Ships |
| 1920 WARREN Landing Device For Aeroplanes Patent |
| 1920 SMITH Protecting Device For Ships Patent |
| 1920 VERDON Landing Device For Aircraft Patent |
| 1920 READ Locking Device For Automobiles Patent |
| 1920 RASSMANN Watering Device For Cattle Patent |
| 1920 TREVOR Sighting Device For Guns Patent |