| All Patents in class 451/396 |
Patents 1 -
10
of 16
      |
| Picture | Number | Date | Patentee | Title |
| | 490,471 | Jan. 24, 1893 | G. Carlyle | Machine for Forming Pearl Buttons |
| | 667,579 | Feb. 05, 1901 | A. Roemisch | Apparatus for Grinding and Smoothing Glass |
| | 1,666,500 | Apr. 17, 1928 | N.I. Lundberg | Metal Working Tool |
| | 1,991,958 | Feb. 19, 1935 | M. Romaine | Grinding Machine |
 | 2,136,491 | Nov. 15, 1938 | E.S. Cornell | Metalworking Machine |
 | 2,314,312 | Mar. 16, 1943 | W.C. Knapp | Grinding method and apparatus |
| | 2,400,826 | May 21, 1946 | H.S. Jakobsen | Universal Grinder Head |
 | 2,413,436 | Dec. 31, 1946 | O.W. Dawson | Grinding Machine |
| | 2,436,588 | Feb. 24, 1948 | J. Martin | Cam Grinding Machine |
 | 2,449,459 | Sep. 14, 1948 | T. Eckert | Perforator Grinding Fixture |
