| All Patents in class 409/67 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 92,565 | Jul. 13, 1869 | B.F. Bee | Screw Threading Machine | milling machines |
| 230,825 | Aug. 03, 1880 | I.S. Schuyler | Machine for Cutting Screw Threads | metal threading machines |
| 320,968 | Jun. 30, 1885 | F.H. Richards | Machine for Making Twist Drills | making drills and augers |
| 392,582 | Nov. 13, 1888 | H.E. Boyd | Machine for Cutting Taps | metal threading machines |
| 2,050,124 | Aug. 04, 1936 | E.G. Roehm | Spiral Milling Machine | milling machines |
| 7,651,383 | Jan. 26, 2010 | H.J. Stadfeld | Method of Lapping Gears | gear making machines |
