| All Patents in class 451/375 |
Patents 31 -
39
of 39
      |
| Number | Date | Patentee | Title | Type |
| 2,805,522 | Sep. 10, 1957 | T.S. Dayton | Apparatus for Sharpening Wood Bits | drill sharpening machines |
| 2,807,920 | Oct. 01, 1957 | R.E. Househo;der | Tool Holder | metalworking machine tool holders |
| 2,911,770 | Nov. 10, 1959 | O.W. Dawson | Fixture for positioning tool relative to grinding head | cutter grinding machines |
| 2,958,167 | Nov. 01, 1960 | A.E. Mueller | Grinder Fixture | grinding attachments |
| 3,037,329 | Jun. 05, 1962 | W.A. Haggerty, E.L. Ritter, H. Ernst | Method and Apparatus for Grinding Drills | drill sharpening machines |
| 3,102,370 | Sep. 03, 1963 | T.A. Ribich | Apparatus for producing a drill point | making drills and augers |
| 5,125,186 | Jun. 30, 1992 | R.L. Schroeder | Drill Grinding Machine | drill grinders |
| 5,319,890 | Jun. 14, 1994 | J.G. Warner | Bushingless Workhead | metalworking machine mechanisms |
| 5,367,836 | Nov. 29, 1994 | K.H. Allen | Automatic Drill Loader | tool changers and storage mechanisms |
