| All Patents in class 451/271 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
| | 79,131 | Jun. 23, 1868 | A. Hathaway, J. Kendall | Grinding Plate Glass |
 | 431,422 | Jul. 01, 1890 | J. Watrous | Pencil-sharpener |
| | 1,233,120 | Jul. 10, 1917 | F.R. Patch | Grinding and Polishing Machine |
| | 1,281,001 | Oct. 08, 1918 | C.R. Hazel | Grinding and Polishing Machine |
| | 1,486,337 | Mar. 11, 1924 | W.E. Hoke | Machine for Making Gauges and Other Articles |
 | 1,577,478 | Mar. 23, 1926 | L.C. Marburg | Cylinder-grinding attachment |
| | 1,631,247 | Jun. 07, 1927 | C.M. Conradson | Gyratory Grinding Machine |
 | 2,371,582 | Mar. 13, 1945 | R.V. Hanchett | Grinding apparatus |
 | 3,205,622 | Sep. 14, 1965 | T.J. Leveque | Rotatable grinding and surfacing tool |
 | 3,287,859 | Nov. 29, 1966 | T.J. Leveque | Rotatable grinding and surfacing tool |
