| All Patents in class 451/227 |
Patents 1 -
10
of 28
      |
| Picture | Number | Date | Patentee | Title |
| | 338,749 | Mar. 30, 1886 | N. Hunt | Lathe for Turning Spherical Surfaces |
| | 441,570 | Nov. 25, 1890 | R.B. Leighton | Lens Grinding Machine |
 | 612,239 | Oct. 11, 1898 | L.E. Harper, C.L. Grohmann | Machine for dressing metals or other materials |
 | 767,387 | Aug. 16, 1904 | N.D. Chard | Wheel Rim Finishing Machine |
 | 945,467 | Jan. 04, 1910 | A.B. Landis | Machine for grinding ball-bearing races |
 | 1,102,558 | Jul. 07, 1914 | C.E. Van Norman | Machine for grinding bearing-races |
 | RE13,892 | Mar. 16, 1915 | C.E. Van Norman | Machine for grinding bearing-races |
| | 1,264,929 | May 07, 1918 | L.R. Heim | Grinding Machine |
 | 1,286,977 | Dec. 10, 1918 | P.P. Fenaux | Grinding Machine |
| | 1,289,924 | Dec. 31, 1918 | A.J. Sanford | Knob Grinding Machine |
