| 1920 KENNEDY DOUGAN Projectile Patent Print Art |
| 1920 CLARENCE JANES Projectile Patent Print Art |
| 1920 HENRY Art Of Projectile Firing Patent Print |
| 1920 TAYLOR BAYARD Projectile Patent Print Art |
| 1920 WILHELM ULRICH Projectile Patent Print Art |
| 1920 EXPL DES PROCEDES WESTINGHOUSE Projectile |
| 1920 KRUPP AG Projectile Patent Print Art |
| 1920 SCHNEIDER CIE Projectile Bomb Throwers Art |
| 1920 JAMES Wire Cutting Projectile Patent Print |
| 1920 BARTHELRMY LOUIS Projectile Patent Print |
| 1920 CLARKE Explosive Projectile Detonation Patent22414 |
| 1920 CLARKE Explosive Projectile Patent Print |
| 1920 MICHAEL RADAKOVICH Projectile Patent Print |
| 1920 HOWARD LIVENS Gas Projectile Patent Print |
| 1920 FITZPATRICK Projectile Throwing Mechanism |
| 1920 BLAND Armor Piercing Projectile Patent |
| 1920 EUGENE Projectile For Bomb Throwers Patent |
| 1920 TAYLOR Projectile Uses High Explosives Patent22391 |
| 1920 JOSEPH Shell Or Projectile Patent Print Art |
| 1920 LUIS KOBUCHI Projectile Patent Print Art |
| 1920 DEUREN PIERRE Projectile Patent Print Art |
| 1920 HADFIELD Produce Projectile Caps MORSE Patent22409 |
| 1920 THORNYCROFT Gun Discharging Projectile Patent22390 |
| 1920 ROOS WILLIAM Projectile Patent Print Art |
| 1920 CHARLES DURHAM Projectile Patent Print Art |
| 1920 GUSTAVE BESSIERE Projectile Patent Print |
| 1920 MURRAY Elongated Cylindrical Projectile Shell |