| All Patents in class 408/81 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 349,963 | Sep. 28, 1886 | A. Willcox, J.D. Watson | Apparatus for Boring Cylinders | portable metal drilling machines |
| 874,702 | Dec. 24, 1907 | E.J. Patton | Gasket or Washer Cutter | washer cutters |
| 1,523,596 | Jan. 20, 1925 | D.C. Klausmeyer | Radial Drill Arm | radial drill presses |
| 1,831,813 | Nov. 17, 1931 | A. Levedahl | Centering guide | handheld power tool accessories |
| 2,078,598 | Apr. 27, 1937 | J.Y. Blazek, R.J. Kuschel | Clamping means | vehicle mechanic |
| 3,046,845 | Jul. 31, 1962 | S.A. Cogsdill | Back Spotface Tool | metalworking counterbores |
