| All Patents in class 409/68 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 627,299 | Jun. 20, 1899 | F.G. Echols | Metal-working machine |
 | 1,194,864 | Aug. 15, 1916 | F. Müller | Machine for making twist drills |
| | 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 |
| | 2,511,821 | Jun. 13, 1950 | E.P. Bullard, III | Control Mechanism |
 | 3,037,428 | Jun. 05, 1962 | H.J. Flair | Automatic milling machine |
| | 3,101,649 | Aug. 27, 1963 | V.L. Mitchell, H.J. Baldwin, R.W. Nashold | Spiral Milling Machine |
