| All Patents in class 451/227 |
Patents 1 -
15
of 28
      |
| Number | Date | Patentee | Title | Type |
| 338,749 | Mar. 30, 1886 | N. Hunt | Lathe for Turning Spherical Surfaces | metal lathe accessories and attachments |
| 441,570 | Nov. 25, 1890 | R.B. Leighton | Lens Grinding Machine | material grinding machines |
| 612,239 | Oct. 11, 1898 | L.E. Harper, C.L. Grohmann | Machine for dressing metals or other materials | bicycle machinery |
| 767,387 | Aug. 16, 1904 | N.D. Chard | Wheel Rim Finishing Machine | metal lathes |
| 945,467 | Jan. 04, 1910 | A.B. Landis | Machine for grinding ball-bearing races | grinders |
| 1,102,558 | Jul. 07, 1914 | C.E. Van Norman | Machine for grinding bearing-races | grinders |
| RE13,892 | Mar. 16, 1915 | C.E. Van Norman | Machine for grinding bearing-races | grinding machines |
| 1,264,929 | May 07, 1918 | L.R. Heim | Grinding Machine | |
| 1,286,977 | Dec. 10, 1918 | P.P. Fenaux | Grinding Machine | grinding machines |
| 1,289,924 | Dec. 31, 1918 | A.J. Sanford | Knob Grinding Machine | |
| 1,515,568 | Nov. 11, 1924 | R.W. Ellingham, G.W. Fleming | Grinding machine | cylindrical grinders |
| 1,722,691 | Jul. 30, 1929 | C.E. Van Norman | Grinding machine | grinders |
| 1,794,271 | Feb. 24, 1931 | H.H. Asbridge | Grinding machine | |
| 1,871,494 | Aug. 16, 1932 | G.A. Carlson | Grinding and polishing machine | polishing and buffing machinery |
| 1,881,984 | Oct. 11, 1932 | C.E. Van Norman | Slide Mechanism for Precision Grinding Machines | grinding machines |
