| 1924 US ORDNANCE COMPANY Breech Mechanism Patent |
| 1950 BEARDSLEY Breech Operating Mechanism Patent |
| 1922 TALIAFERRO Breech Mechanism For Guns Patent |
| 1921 CHARLES Breech Block Mechanism Patent Print |
| 1948 WILLIAM Breech Operating Mechanism Patent |
| 1929 MCCANN Breech Mechanism For Guns Patent |
| 1927 TREVOR Ordnance Breech Mechanism Patent |
| 1927 ESSEN PIETER Breech Mechanism Patent Print |
| 1957 GAIDOS Breech Mechanism For A Rifle Patent |
| 1924 STAMBAUGH Breech Mechanism Patent Print Art |
| 1946 WILLIAM Breech Block Mechanism Patent Print |
| 1922 ASBURY DORSEY Breech Mechanism Patent Print |
| 1924 TREVOR Ordnance Breech Mechanism Patent |
| 1953 PETERS Breech Mechanism For Firearms Patent |
| 1954 COCHRAN Breech Operating Mechanism Patent |
| 1923 TOM Breech Closing Mechanism Patent Print |
| 1920 STAMBAUGH Breech Mechanism Patent Print Art |
| 1958 STERN Breech Block Mechanism Patent Print |
| 1928 MCCANN Breech Opening Mechanism Patent |
| 1922 TREVOR Ordnance Breech Mechanism Patent |
| 1949 RATAICZAK Breech Bolt Mechanism Patent |
| 1920 TREVOR Breech Mechanism Of Ordnance Patent |
| 1922 TALIAFERRO Breech Closure Mechanism Patent |
| 1928 TREVOR Ordnance Breech Mechanism Patent |
| 1920 TREVOR Ordnance Breech Mechanism Patent |
| 1953 SIMPSON Breech Locking Mechanism Patent |
| 1959 MULNO Breech Release Mechanism Patent Print |