| All Patents in class 72/220 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
| | 6,332X | Jan. 11, 1831 | G. Stoudinger | Springs, edging and drawing steel points |
| | 16,337 | Jan. 06, 1857 | J.J. Laubach | Grooving Sheet-Metal |
| | 78,486 | Jun. 02, 1868 | W. Serviss | Machine for Grooving Sheet Metal |
 | 98,002 | Dec. 14, 1869 | R. McChesney, D. Wilcox | Improved machine for making carriage-clips |
 | 128,287 | Jun. 25, 1872 | R. Crooker | Improvement in machines for straightening rolled-metal plates |
| | 407,530 | Jul. 23, 1889 | T.W. Irwin | Machine for Shaping Sheet Metal |
| | 450,463 | Apr. 14, 1891 | G. Kennedy | Grooving Machine Attachment |
| | 924,828 | Jun. 15, 1909 | S.A. James, J.A. Pittman | Pipe Joining Machine |
