| All Patents in class 409/221 |
Patents 1 -
10
of 57
      |
| Picture | Number | Date | Patentee | Title |
| | 40,550 | Nov. 10, 1863 | A.T. Boon | Gear Cutting |
 | 139,124 | May 20, 1873 | W.H. Dobson | Improvement in saw-setting machines |
 | 362,082 | May 03, 1887 | G.A. Mueller, F. Holz | Milling Machine |
| | 406,413 | Jul. 02, 1889 | C.L. Libby | Turret Lathe |
| | 414,174 | Oct. 29, 1889 | C.H. Trask | Work Holder for Milling Machines |
 | 464,233 | Dec. 01, 1891 | J. Sherman | Gear-cutting machine |
 | 731,870 | Jun. 23, 1903 | F.G. Echols | Indexing Mechanism |
 | 910,937 | Jan. 26, 1909 | E.P. Miller | Multiple-spindle index-center |
| | 1,067,682 | Jul. 15, 1913 | O. Rössler | Dividing-Head |
| | 1,188,043 | Jun. 20, 1916 | F.F. Clarke | Stop Index System for Boring Mills |
