| 1920 BLACKLOCK Method Of Controlling Guns Patent |
| 1920 EUGENE Apparatus For Aiming Guns Patent |
| 1920 GEORGE HAZELTON Firing Of Guns Patent Print |
| 1920 VICKERS LTD Sighting Device For Guns Patent |
| 1920 WALKER Shell For Machine Guns Patent Print |
| 1920 EUGENE Apparatus For Loading Guns Patent |
| 1920 SCHNEIDER CIE Aiming Guns Art Print Patent |
| 1920 VEEDER Indicator Magazine Guns War Patent 22388 |
| 1920 CURTIS Bolting Mechanism For Guns Patent |
| 1920 EUGENE Sighting Device For Guns Patent |
| 1920 KRUPP AG Turntable For Railway Guns Patent |
| 1920 EUGENE Hydraulic Brake For Guns Patent |
| 1920 EUGENE Aiming Apparatus For Guns Patent |
| 1920 EUGENE SCHNEIDER Brake For Guns Patent |
| 1920 SAUNDERS Mounting For Heavy Guns Patent |
| 1920 MCLEOD Light Attachment For Guns Patent |
| 1920 DAISY MFG COMPANY Lever Arm For Guns Patent |
| 1920 FRITZ Turntable For Railway Guns Patent |
| 1920 HUSSEY Indicator For Magazine Guns Patent |
| 1920 SCHNEIDER & CIE Brake For Guns Patent Print |
| 1920 LEFEVER Lever Arm For Guns Patent Print Art |
| 1920 TREVOR Sighting Device For Guns Patent |
| 1920 CRAIG ALVIN Buffer For Guns Patent Print |