| All Patents in class 409/70 |
Patents 1 -
9
of 9
      |
| Picture | Number | Date | Patentee | Title |
| | 153,804 | Aug. 04, 1874 | H.E. Boyd | Lathe Attachments for Cutting Screw Taps |
 | 627,299 | Jun. 20, 1899 | F.G. Echols | Metal-working machine |
| | 688,515 | Dec. 10, 1901 | B.M. Hanson | Metal Working Machine |
| | 920,606 | May 04, 1909 | A.L. Moore | Machine For Cutting Threads On Shanks of Wrench Jaws |
| | 1,200,046 | Oct. 03, 1916 | A.M. Thompson | Screw-Thread-Milling Machine |
| | 1,252,763 | Jan. 08, 1918 | G.W. Drake, O. Zerk | Thread Milling Machine |
| | 1,274,502 | Aug. 06, 1918 | O.S. Bickford | Machine for Flutiing Twist Drill Blanks |
| | 2,090,992 | Aug. 24, 1937 | W.D. Archea | Thread Milling Machine |
 | 2,382,662 | Aug. 14, 1945 | A.J. Prance | Thread milling machine |
