| All Patents in class 408/225 |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
 | 101,164 | Mar. 22, 1870 | J.G. Robinson | Improvement in hub-reamer |
| | 370,484 | Sep. 27, 1887 | A. Latham | Counterbore Reamer or Countersink |
 | 631,572 | Aug. 22, 1899 | L. Judson | Countersink Attachment |
 | 782,221 | Feb. 14, 1905 | P.J. Creeden | Auger-Bit |
 | 996,612 | Jul. 04, 1911 | J.W. Caldwell | Auger-Bit |
 | 1,667,218 | Apr. 24, 1928 | T.S. Purnis | Tool for planing valve seats |
 | 2,829,544 | Apr. 08, 1958 | W.C. Bergstrom | Countersinking and counterboring tool |
| | 2,897,696 | Aug. 04, 1959 | H.R. Tisserant | Sheet metal panel drill |
 | 4,032,251 | Jun. 28, 1977 | T.A. Ribich | Countersinking and deburring tool |
 | 4,527,449 | Jul. 09, 1985 | W.E. Sydlowski, H.A. Trent | Boring bit and method for manufacture thereof |
