| All Patents in class 451/223 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 932,791 | Aug. 31, 1909 | R.K. Blond, W.F. Groene | Cutter-grinder | tool grinders |
| 938,803 | Nov. 02, 1909 | C.E. Van Norman | Metal-working machinery | cylindrical grinders |
| 1,018,395 | Feb. 20, 1912 | A.B. Landis | Grinding-machine | grinders |
| 1,395,391 | Nov. 01, 1921 | E.R. Conners | Device for Truing and Dressing Grinding Wheels | grinder dressers |
| 1,395,392 | Nov. 01, 1921 | E.R. Conners | Device for Truing and Dressing Grinding Wheels | grinder dressers |
| 1,544,287 | Jun. 30, 1925 | C.E. Van Norman | Grinding machine | cylindrical grinders |
| 1,877,500 | Sep. 13, 1932 | H.R. Isler, S. Einstein | Hydraulic Grinder | grinding machines |
| 1,952,432 | Mar. 27, 1934 | F.S. Haas | Grinding Machine | grinding machines |
| 1,980,682 | Nov. 13, 1934 | R.E. Harrison | Grinding Machine | grinding machines |
| 2,012,065 | Aug. 20, 1935 | F.S. Haas, R.L. Goetzel | Grinding Machine | grinding machines |
| 2,241,634 | May 13, 1941 | J. Decker | Automatic Infeed Mechanism for Grinding Machines | grinding machines |
| 2,370,041 | Feb. 20, 1945 | J. Jesionowski | External grinder | grinders |
