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| All Patents in class 451/544 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 187,593 | Feb. 20, 1877 | A.A. Sanborn, I.P. Brown, Jr. | Emery Grinding Wheels | ||
 | 201,778 | Mar. 26, 1878 | G. Hart | Emery Wheel | |
| 1,287,731 | Dec. 17, 1918 | F. Müller | Automatic Grinding Machine | ||
| 3,447,306 | Jun. 03, 1969 | J. Zigmant | Abrading machine | ||