| All Patents in class 408/193 |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
 | 74,870 | Feb. 25, 1868 | P.A. Whitney | Drill and Countersink |
 | 92,261 | Jul. 06, 1869 | R.P. Buttles | Improvement in Countersink |
 | 94,416 | Aug. 31, 1869 | M. Jincks | Improvement in Plug-Cutter |
 | 137,373 | Apr. 01, 1873 | F. Jonas | Adjustable Countersink Bit-Assembly |
 | 267,590 | Nov. 14, 1882 | A.O. Revenaugh | Bit and countersink |
 | 298,248 | May 06, 1884 | A.J. Smart | Combined Drill and Countersink |
 | 303,053 | Aug. 05, 1884 | C.P. Russell | Combined Drill and Countersink |
 | 385,791 | Jul. 10, 1888 | F.B. Carpenter | Combined Bit, Countersink, and Screw-Driver |
 | 421,218 | Feb. 11, 1890 | M. Wood | Countersink/Counterbore Bit |
 | 431,610 | Jul. 08, 1890 | E.T. Mueller | Reamer Attachment for Die Stocks |
