| All Patents in class 409/69 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 54,096 | Apr. 24, 1866 | B.F. Bee | Improved screw-tap | taps and dies |
| 79,721 | Jul. 07, 1868 | T.D. Bassett | Threading Screws | screwcutting lathes |
| 169,080 | Oct. 26, 1875 | H.E. Boyd | Machines for Cutting Screw Taps | metal threading machines |
| 230,825 | Aug. 03, 1880 | I.S. Schuyler | Machine for Cutting Screw Threads | metal threading machines |
| 233,821 | Oct. 26, 1880 | J.H. Vinton | Machine for Cutting Screw Threads | metal threading machines |
| 454,029 | Jun. 16, 1891 | A.W. Cash | Machine for Cutting Dies Taps &c. | metal threading machines |
| 638,450 | Dec. 05, 1899 | J.B. Durst | Groove-cutting machine | dado machines |
| 688,515 | Dec. 10, 1901 | B.M. Hanson | Metal Working Machine | milling machines |
| 2,413,436 | Dec. 31, 1946 | O.W. Dawson | Grinding Machine | tool grinders |
| 3,101,649 | Aug. 27, 1963 | V.L. Mitchell, H.J. Baldwin, R.W. Nashold | Spiral Milling Machine | milling machines |
| 3,774,501 | Nov. 27, 1973 | H.H. Ranney, R.W. Brown | Thread Milling Attachment | metal lathe accessories and attachments |
| 4,173,786 | Nov. 06, 1979 | A.V. Dryak, R.C. Tanner, T.J. Kuhnell | Method and Apparatus for Cutting a Thread on a Rotating Workpiece | machine tool controls |
