| All Patents in class 451/374 |
Patents 46 -
60
of 75
      |
| Number | Date | Patentee | Title | Type |
| 1,835,687 | Dec. 08, 1931 | H.M. Allison | Backing-Off Mechanism for Grinding Machines | grinding attachments |
| 1,835,733 | Dec. 08, 1931 | H.M. Allison, E.A. Walker | Backing Off Mechanism for Grinding Machines | grinding attachments |
| 1,847,045 | Feb. 23, 1932 | W.H. Evans | Reamer sharpening machine | sharpening machines |
| 1,897,035 | Feb. 14, 1933 | C.J. Anderson | Grinding machine | sharpening machines |
| 1,917,504 | Jul. 11, 1933 | F.W. Curtis | Cutter Grinder | sharpening machines |
| 2,002,971 | May 28, 1935 | H.W. Zimmerman | Reamer sharpener | reamers |
| 2,035,163 | Mar. 24, 1936 | K.W. Holmberg | Tool Holder and Guide | sharpening tool holders |
| 2,118,912 | May 31, 1938 | J.B. Armitage | Cutter Grinder | tool grinders |
| 2,118,967 | May 31, 1938 | F.W. Curtis | Cutter grinder | tool grinders |
| 2,135,894 | Nov. 08, 1938 | E.C. Head | Machine for forming spiral bevel gear cutters | sharpening machines |
| 2,192,370 | Mar. 05, 1940 | E. Wildhaber | Apparatus For Relieving Cutters | metal relieving attachments |
| 2,212,855 | Aug. 27, 1940 | W.N. Chittenden | Combination Tool Head and Grinding Mechanism | tool grinders |
| 2,332,421 | Oct. 19, 1943 | E. Wildhaber | Method And Machine For Relieving Cutters | metal relieving machines |
| 2,425,859 | Aug. 19, 1947 | O.M. Braaten | Cutter Grinder | tool grinders |
| 2,460,078 | Jan. 25, 1949 | J.D. Faudree | Work Holder for Tool Grinders | sharpening tool holders |
