| All Patents in class 451/239 |
Patents 16 -
30
of 52
      |
| Number | Date | Patentee | Title | Type |
| 960,408 | Jun. 07, 1910 | J.L. Nolan, F.C. Rowell | Abrading-machine | sanding machines |
| 1,017,879 | Feb. 20, 1912 | A.B. Landis | Grinding-machine | grinders |
| 1,231,920 | Jul. 03, 1917 | T. Lumsden | Tool Holder for Grinding Machines | sharpening tool holders |
| 1,255,962 | Feb. 12, 1918 | E.D. Paul, C.C. Warner | Grinding Machine | |
| 1,259,770 | Mar. 19, 1918 | C.G. Olson | Grinding Machine | |
| 1,273,892 | Jul. 30, 1918 | T. Lund | Grinding Machine | |
| 1,323,452 | Dec. 02, 1919 | S.A. Cogsdill | Machine for Grinding Tools | tool grinders |
| 1,609,643 | Dec. 07, 1926 | L. Daly | Grinding Machine | grinding machines |
| 1,840,231 | Jan. 05, 1932 | F.S. Haas, R.E. Harrison | Grinding Machine | grinding machines |
| 1,864,486 | Jun. 21, 1932 | S. Einstein | Art of Grinding | grinding machines |
| 1,894,382 | Jan. 17, 1933 | L. Mawer | Cam and like grinding machine | |
| 1,904,304 | Apr. 18, 1933 | R.E. Flanders | Method and Machine for Grinding Chasers | tool grinders |
| 2,012,078 | Aug. 20, 1935 | G.W. Binns | Art of Grinding | grinding machines |
| 2,024,283 | Dec. 17, 1935 | F.M. Gertiser | Grinding Machine | grinding machines |
| 2,045,894 | Jun. 30, 1936 | G.W. Binns | Grinding Machine | grinding machines |
