| All Patents in class 409/221 |
Patents 1 -
15
of 56
      |
| Number | Date | Patentee | Title | Type |
| 40,550 | Nov. 10, 1863 | A.T. Boon | Gear Cutting | gear making machines |
| 139,124 | May 20, 1873 | W.H. Dobson | Improvement in saw-setting machines | saw sharpening machines |
| 362,082 | May 03, 1887 | G.A. Mueller, F. Holz | Milling Machine | milling machines |
| 406,413 | Jul. 02, 1889 | C.L. Libby | Turret Lathe | turret lathes |
| 414,174 | Oct. 29, 1889 | C.H. Trask | Work Holder for Milling Machines | jigs and fixtures |
| 464,233 | Dec. 01, 1891 | J. Sherman | Gear-cutting machine | gear making machines |
| 731,870 | Jun. 23, 1903 | F.G. Echols | Indexing Mechanism | |
| 910,937 | Jan. 26, 1909 | E.P. Miller | Multiple-spindle index-center | milling machine accessories |
| 1,067,682 | Jul. 15, 1913 | O. Rössler | Dividing-Head | indexers and dividers |
| 1,188,043 | Jun. 20, 1916 | F.F. Clarke | Stop Index System for Boring Mills | metalworking machine mechanisms |
| 1,232,801 | Jul. 10, 1917 | H.J. Hjorth | Universal Lathe Attachment | metal lathe accessories and attachments |
| 1,330,897 | Feb. 17, 1920 | C.D. Oesterlein, L.H. Blood | Milling-machine | milling machines |
| 1,364,324 | Jan. 04, 1921 | J. Siakel | Sandpapering-machine | belt sanders |
| 1,437,902 | Dec. 05, 1922 | F.H. Mayoh | Milling Machine Construction | milling machines |
| 1,507,381 | Sep. 02, 1924 | W. Jannell | Commutator-slotting machine | electric motor making |
