| All Patents in class 408/192 |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
 | 52,174 | Jan. 23, 1866 | A. Parsons, C.F. Kimball | Improvement in Bits for Boring Holes |
 | 62,849 | Mar. 12, 1867 | T. Hofstatter | Improvement in Augers |
 | 63,392 | Apr. 02, 1867 | M. Jincks | Improvement in Boring Bits |
 | 80,915 | Aug. 11, 1868 | L. Colt | Auger |
 | 137,373 | Apr. 01, 1873 | F. Jonas | Adjustable Countersink Bit-Assembly |
 | 178,448 | Jun. 06, 1876 | W.H. Laughlin | Improvement in Countersinks |
 | 256,979 | Apr. 25, 1882 | J.W. Cooper | Washer Cutter and Adjustable Bit |
 | 326,342 | Sep. 15, 1885 | J.C. Smith | Adjustable Concentric Channeler |
 | 327,641 | Oct. 06, 1885 | G.S. Forrest, G.W. Abbott | Countersink |
 | 458,091 | Aug. 18, 1891 | C. Beauchene | Expansion-Bit |
