| 1920 AUTO ORDNANCE CORP Gun Lubrication Patent |
| 1920 TREVOR Breech Loading Ordnance Patent Print |
| 1920 PAYNE OSCAR Gun AUTO ORDNANCE CORP Patent |
| 1920 AUTO ORDNANCE CORP Breech Closure Patent |
| 1920 AUTO ORDNANCE CORP Gun Patent Print Art |
| 1920 TREVOR Lock Mechanism Of Ordnance Patent |
| 1920 TREVOR Recoil Apparatus Of Ordnance Patent |
| 1920 AUTO ORDNANCE CORP Ordnance Patent Print |
| 1920 AUTO ORDNANCE CORP Gun Magazine Patent |
| 1920 AUTO ORDNANCE CORP Firearm Patent Print Art |
| 1920 LEONARDO Recoll Operated Ordnance Patent |
| 1920 VICKERS LTD Breech Loading Ordnance Patent |
| 1920 US ORDNANCE COMPANY Gun Structure Patent |
| 1920 DELAUNAY BELLEVILLE ETS Ordnance Patent |
| 1920 TREVOR Ordnance Firing Mechanism Patent |
| 1920 AUTO ORDNANCE CORP Magazine Patent Print |
| 1920 WILLIAM S PEIRCE Ordnance Patent Print Art |
| 1920 AUTO ORDNANCE CORP Gun Element Patent Print |
| 1920 TREVOR Firing Mechanism Of Ordnance Patent |
| 1920 GAY WILLIAM Ordnance Device Patent Print |
| 1920 US GOVERNMENT Ordnance Patent Print Art |
| 1920 AUTO ORDNANCE CORP Gun Mechanism Patent |
| 1920 TREVOR Breech Mechanism Of Ordnance Patent |
| 1920 MUIR DORA Ordnance US GOVERNMENT Patent |
| 1920 TREVOR Ordnance Breech Mechanism Patent |