| All Patents in class 451/48 |
Patents 16 -
21
of 21
      |
| Number | Date | Patentee | Title | Type |
| 2,917,952 | Dec. 22, 1959 | J.A. Lavallee | Reamer manufacture | reamers |
| 2,981,038 | Apr. 25, 1961 | E.V. Flanders | Method of Grinding Helical Forms | thread grinders |
| 3,037,329 | Jun. 05, 1962 | W.A. Haggerty, E.L. Ritter, H. Ernst | Method and Apparatus for Grinding Drills | drill sharpening machines |
| 3,109,270 | Nov. 05, 1963 | W.A. Haggerty | Drill Grinding Method | drill grinders |
| 3,538,649 | Nov. 10, 1970 | T.V. Williams | Apparatus for Sharpening Multiedge Tools | cutter grinding machines |
| 5,179,809 | Jan. 19, 1993 | R.L. Schroeder | Drill Grinding Machine | drill grinders |
