| All Patents in class 408/193 |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 74,870 | Feb. 25, 1868 | P.A. Whitney | Drill and Countersink | metalworking countersinks |
| 92,261 | Jul. 06, 1869 | R.P. Buttles | Improvement in Countersink | countersinks |
| 94,416 | Aug. 31, 1869 | M. Jincks | Improvement in Plug-Cutter | countersinks |
| 137,373 | Apr. 01, 1873 | F. Jonas | Adjustable Countersink Bit-Assembly | countersinks |
| 267,590 | Nov. 14, 1882 | A.O. Revenaugh | Bit and countersink | countersinks |
| 298,248 | May 06, 1884 | A.J. Smart | Combined Drill and Countersink | countersinks |
| 303,053 | Aug. 05, 1884 | C.P. Russell | Combined Drill and Countersink | countersinks |
| 385,791 | Jul. 10, 1888 | F.B. Carpenter | Combined Bit, Countersink, and Screw-Driver | combination tools |
| 421,218 | Feb. 11, 1890 | M. Wood | Countersink/Counterbore Bit | countersinks |
| 431,610 | Jul. 08, 1890 | E.T. Mueller | Reamer Attachment for Die Stocks | reamers |
| 444,161 | Jan. 06, 1891 | F.J. Roche | Combined Screwdriver, Gimlet & Reamer Bit | countersinks |
| 532,472 | Jan. 15, 1895 | S.B. Minnich | Countersink-tool | countersinks |
| 695,559 | Mar. 18, 1902 | W. Jackmond | Reamer | tapered reamers |
| 1,279,302 | Sep. 17, 1918 | J.M. Dunlap | Drill Gage and Countersink | drill depth stops |
