| All Patents in class 29/DIG.057 |
Patents 1 -
6
of 6
      |
| Picture | Number | Date | Patentee | Title |
| | 928,758 | Jul. 20, 1909 | E.E. Houghton | Pneumatic attachment for mortising machines |
 | 1,090,299 | Mar. 17, 1914 | A.M. Harrington, R.F. Scott | Bolt-cutting machine |
 | 1,208,289 | Dec. 12, 1916 | F.M. Carroll | Gun-barrel-drilling machine |
| | 1,398,338 | Nov. 29, 1921 | J.F. Mirrielees | Lubricating device for drill-presses and the like |
 | 2,036,658 | Apr. 07, 1936 | B.F. Stowell | Automatic grinding machine |
 | 2,300,389 | Oct. 27, 1942 | H.W. Ruppel | Coolant control and lock for spindle turrets |
