| All Patents in class 409/69 |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
 | 54,096 | Apr. 24, 1866 | B.F. Bee | Improved screw-tap |
 | 79,721 | Jul. 07, 1868 | T.D. Bassett | Threading Screws |
| | 169,080 | Oct. 26, 1875 | H.E. Boyd | Machines for Cutting Screw Taps |
| | 230,825 | Aug. 03, 1880 | I.S. Schuyler | Machine for Cutting Screw Threads |
| | 233,821 | Oct. 26, 1880 | J.H. Vinton | Machine for Cutting Screw Threads |
| | 454,029 | Jun. 16, 1891 | A.W. Cash | Machine for Cutting Dies Taps &c. |
| | 638,450 | Dec. 05, 1899 | J.B. Durst | Groove-cutting machine |
| | 688,515 | Dec. 10, 1901 | B.M. Hanson | Metal Working Machine |
| | 977,540 | Dec. 06, 1910 | H.W. Oster | Thread-cutting mechanism |
| | 1,047,280 | Dec. 17, 1912 | H.W. Oster | Thread-cutting mechanism |
