| All Patents in class 451/215 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 9,976 | Aug. 30, 1853 | S. Darling | Apparatus for Grinding & Shaping Metals | surface grinders |
| 18,509 | Oct. 27, 1857 | G.F. Butterfield, D. Lovejoy | Grinding and polishing metal | cutter grinding |
| 81,608 | Sep. 01, 1868 | J.P. Curtiss | Machine for Grinding Metal Articles | grinders |
| 1,717,899 | Jun. 18, 1929 | G.D. Sundstrand | Grinding Machine | internal grinders |
| 2,360,671 | Oct. 17, 1944 | A.C. Janke, C.O. Graves, F.S. Haas | Surface Grinder | grinding machines |
| 2,386,283 | Oct. 09, 1945 | E.A. Reibig, C.A. Wiken | Machine tool | surface grinders |
