| All Patents in class 51/309 |
Patents 1 -
10
of 15
      |
| Picture | Number | Date | Patentee | Title |
| | 94,955 | Sep. 21, 1869 | R.J. Costain, N.B. Hadley | Improved compound for emery-wheels and oil-stones |
| | 95,824 | Oct. 12, 1869 | E.C. Merrill, A.W. Willard | Improved composition for emery-wheels and other abrading-implements |
 | 108,408 | Oct. 18, 1870 | B.C. Tilghman | Improvement in cutting and engraving stone, metal, glass, &c. |
| | 113,439 | Apr. 04, 1871 | E.C. Merrill | Improvement in the manufacture of emery-wheels and artificial stone |
 | 226,066 | Mar. 30, 1880 | G. Hart | Emery-wheel |
| | 237,311 | Feb. 01, 1881 | F.B. Norton | Art of Preparing Emery in the Manufacture of Grinding Stones |
| | 261,198 | Jul. 18, 1882 | R. Barton | Dental Grinding Tool |
 | 341,867 | May 18, 1886 | L.W. Andrews | Grinding-machine |
| | 2,523,698 | Sep. 26, 1950 | F.E. Hawley | Method of Making Diamond Loaded Abrasive Articles |
 | 2,545,676 | Mar. 20, 1951 | L. Small | Diamond impregnated dressing tool |
