| All Patents in class 408/191 |
Patents 16 -
22
of 22
      |
| Number | Date | Patentee | Title | Type |
| 295,466 | Mar. 18, 1884 | J.B. Wallace | Cutting Tool | drill bits |
| 299,429 | May 27, 1884 | A.J. Smart | Combined Drill and Countersink | countersinks |
| 567,977 | Sep. 22, 1896 | T.F. Hagerty | Center Bit | wood drill bits |
| 605,184 | Jun. 07, 1898 | G.E. Miller | Recessing Tool for Lathes | lathe tools |
| 679,693 | Jul. 30, 1901 | W. Burkhart | Combined Drill and Countersink | countersinks |
| 687,724 | Dec. 03, 1901 | J.F. Cadell | Boring-tool | drill bits |
| 1,435,639 | Nov. 14, 1922 | A. Gundersen | Countersinking Attachment For Auger Bits | countersinks |
