| All Patents in class 409/306 |
Patents 1 -
10
of 18
      |
| Picture | Number | Date | Patentee | Title |
| | 7,178 | Mar. 12, 1850 | J. Culbertson, E. Williams | Machine for Giving Increased Twist in Cutting Rifles |
| | 12,285 | Jan. 23, 1855 | E.K. Root | Rifling Machine |
| | 33,884 | Dec. 10, 1861 | W.H. Gwynne | Improvement in Machinery for Rifling Guns |
| | 34,661 | Mar. 11, 1862 | P. Foy | Improvement in Apparatus for Boring and Rifling Cannon |
| | 37,054 | Dec. 02, 1862 | T. Powers | Rifling Machine |
| | 37,057 | Dec. 02, 1862 | C. Sharps | Rifling Machine |
| | 37,898 | Mar. 17, 1863 | A. Bonzano | Improvement in Machinery for Rifling Cannons |
| | 38,000 | Mar. 24, 1863 | G.W. Bigelow | Rifling Machine |
| | 46,714 | Mar. 07, 1865 | C. Sellers, W. Sellers | Machine for Rifling Gun Barrels |
| | 157,034 | Nov. 17, 1874 | W.D. Squires | Machines for Enlarging the Bore of Gun-Barrels |
