| 1924 JULES Equilibrated Breech Block Patent |
| 1863 GROSS Breech Loading Firearm Patent 11672 |
| 1941 WILLIAM Breech Closure For Guns Patent |
| 1921 CHARLES Breech Block Mechanism Patent Print |
| 1849 MINESINGER Breech Loading Firearm Patent 9850 |
| 1952 WELLS Air Gun Breech Magazine Patent Print |
| 1837 FARY Breech Loading Firearm Patent 11710 |
| 1957 GAIDOS Breech Mechanism For A Rifle Patent |
| 1967 KRUZELL Closed Breech Rocket Gun Patent |
| 1965 KRUZELL GEORGE Closed Breech Gun Patent |
| 1920 VICKERS LTD Breech Loading Ordnance Patent |
| 1920 STAMBAUGH Breech Mechanism Patent Print Art |
| 1958 STERN Breech Block Mechanism Patent Print |
| 1966 KRUZELL Closed Breech Rocket Gun Patent |
| 1928 MCCANN Breech Opening Mechanism Patent |
| 1869 FAIRBANKS Firearm Breech Loader Patent 11660 |
| 1952 SHERVILLE Multiple Breech Closing Patent |
| 1920 TREVOR Breech Mechanism Of Ordnance Patent |
| 1932 DOMENICO Breech Loading Gun Patent Print |
| 1949 SWIPP Nonfouling Breech Sealing Ring Patent |