| All Patents in class 451/276 |
Patents 1 -
15
of 20
      |
| Number | Date | Patentee | Title | Type |
| 173,234 | Feb. 08, 1876 | W.H. Ogilvie | Improvement in Machines for Grinding [Insertable] Saw-Teeth | saw sharpening machines |
| 541,349 | Jun. 18, 1895 | F.N. Gardner | Grinding and Polishing Machine | bench or pedestal grinders |
| 630,536 | Aug. 08, 1899 | L.S. Heald, J.N. Heald | Drill-grinding machine | drill grinders |
| 641,107 | Jan. 09, 1900 | W.C. Heister | Machine for grinding drills | drill grinders |
| 643,927 | Feb. 20, 1900 | O.S. Walker | Drill-grinder | drill sharpening machines |
| 736,843 | Aug. 18, 1903 | R.C. Greenerd | Tool Grinder | tool grinders |
| 779,646 | Jan. 10, 1905 | G. Gorton | Grinding Machine | grinding machines |
| 1,207,535 | Dec. 05, 1916 | F.E. Gardner | Disk grinder | disk sanders |
| 1,268,967 | Jun. 11, 1918 | J.W. Hampton | Grinding Machine | |
| 1,337,353 | Apr. 20, 1920 | E.B. Gardner | Grinding-machine | grinders |
| 1,661,330 | Mar. 06, 1928 | R.D. Gardner, J. Nielsen, E.B. Gardner | Grinding machine | |
| 2,000,216 | May 07, 1935 | G.A. Carlson | Grinding machine | grinders |
| 2,021,602 | Nov. 19, 1935 | P.S. Jackson | Grinding machine | |
| 2,119,741 | Jun. 07, 1938 | W.H. Fischer | Drill Grinding Tool | drill grinders |
| 2,179,869 | Nov. 14, 1939 | F.R. Swanson | Grinding machine | |
