| All Patents of Type: metalworking counterbores |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 370,484 | Sep. 27, 1887 | A. Latham | Counterbore Reamer or Countersink | metalworking counterbores |
| 1,341,934 | Jun. 01, 1920 | G.C. Schoenborn | Tool Holder | drilling and boring tool holders |
| CA-216,497 | Mar. 07, 1922 | G.C. Schoenborn | Porte-Outil | drilling and boring tool holders |
| 1,702,485 | Feb. 19, 1929 | O. Severson | Adjustable Counterbore | metalworking counterbores |
| 1,975,215 | Oct. 02, 1934 | U.G. Thomas | Tool Holder | drilling and boring tool holders |
| 2,120,622 | Jun. 14, 1938 | J. Nelson, C.J. Oxford | Boring Tool | metalworking counterbores |
| 2,372,028 | Mar. 20, 1945 | V.E. Smith | Counterboring Tool With Pilot and Holder | drilling and boring tool holders |
| 3,046,845 | Jul. 31, 1962 | S.A. Cogsdill | Back Spotface Tool | metalworking counterbores |
