| All Patents in class 451/476 |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 272,480 | Feb. 20, 1883 | H.A. Rowland | Apparatus for Grinding Screws | grinding fixtures |
| 1,696,477 | Dec. 25, 1928 | G.J. Lindroth, E.A. Hall | Cylinder Hone | honing tools |
| 1,791,491 | Feb. 10, 1931 | W.F. Emerson | Cylindrical Honing Tool | honing tools |
| 1,925,709 | Sep. 05, 1933 | H.W. Zimmerman | Cylinder grinding tool | automotive tools |
| 1,959,891 | May 22, 1934 | H.W. Zimmerman | Bearing hone | automotive tools |
| 2,331,523 | Oct. 12, 1943 | F.G. Wacker | Cylinder grinding tool | automotive tools |
| 2,780,893 | Feb. 12, 1957 | E.Y. Seborg, D.K. Greenberg | Honing machine | honing machines |
| 3,016,660 | Jan. 16, 1962 | M.J. Gross | Hone and abrasive element therefor | honing machines |
| 3,369,330 | Feb. 20, 1968 | M.R. Estabrook, D.K. Greenberg | Automatic abrading machine | |
