| All Patents in class 409/326 |
Patents 16 -
22
of 22
      |
| Number | Date | Patentee | Title | Type |
| 1,355,780 | Oct. 12, 1920 | G. Richards | Machine for Backing Off the Teeth of Hobs for Cutting Screw Threads | backing off lathes |
| 1,432,011 | Oct. 17, 1922 | E.J. Armstrong | Slot Cutting Machine | wrench handle components |
| 1,675,136 | Jun. 26, 1928 | E.P. Sacrey | Machine for Cutting Oil Grooves | oil grooving machines |
| 1,745,573 | Feb. 04, 1930 | J.J. Harten | Vertical Shaping Machine | metal slotting machines |
| 2,084,061 | Jun. 15, 1937 | H.E. Morton | Keyway Forming Machine | metal shapers |
| 2,944,468 | Jul. 12, 1960 | M.W. Hazelton, R.E. Griesheimer, J.M. Allnutt | Shaper | metal shapers |
| 6,942,438 | Sep. 13, 2005 | S.L. Deguise | Keyway Cutter Tool and Method | keyway cutting machines |
