| All Patents in class 408/191 |
Patents 1 -
15
of 22
      |
| Number | Date | Patentee | Title | Type |
| 9,705 | May 10, 1853 | A.G. Bachelder | Countersink | countersinks |
| 19,829 | Apr. 06, 1858 | J. Quigley, N. Clare | Reamer/Plug Cutter Attachment | drill accessories |
| 41,894 | Mar. 08, 1864 | H.S. Shepardson | Improvement in Countersinks | countersinks |
| 43,673 | Aug. 02, 1864 | R. Dudgeon | Drill | drill bits |
| 74,490 | Feb. 18, 1868 | J.A. Bidwell | Screwdriver and Countersink | screwdriver blades |
| 93,807 | Aug. 17, 1869 | W.A. Clark | Improvement in Countersink and Bit | countersinks |
| 103,461 | May 24, 1870 | S.E. Holbrook, Jr. | Improvement in Countersinks | countersinks |
| 108,837 | Nov. 01, 1870 | W.B. Shedd | Improvement in Countersinks | countersinks |
| 110,494 | Dec. 27, 1870 | M.M. Pettes | Improvement in Countersinks | countersinks |
| 112,176 | Feb. 28, 1871 | F.H. Palmer | Improvement in countersinks | countersinks |
| 123,463 | Feb. 06, 1872 | W.H. Dodge | Improvement in Countersinks and Plug-Borers | countersinks |
| 167,884 | Sep. 21, 1875 | T.P. Farmer | Improvement in Countersinks | countersinks |
| 179,778 | Jul. 11, 1876 | W.B. Erskine | Improvement in countersinks | countersinks |
| 253,115 | Jan. 31, 1882 | I. Sharp | Boring and Cutting Implement | drill bits |
| 277,859 | May 15, 1883 | R.J. Welles | Countersinks for Chamfering Bits and Drills | countersinks |
