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| All Patents in class 451/550 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,274,591 | Aug. 06, 1918 | C.E. Quimby | Grinder | ||
| 1,281,001 | Oct. 08, 1918 | C.R. Hazel | Grinding and Polishing Machine | ||
| 1,448,694 | Mar. 13, 1923 | A.E. Maynard | Tool Holder for Grinding Machines | ||
 | 1,932,319 | Oct. 24, 1933 | H.L. Myers | Surface grinding machine | |
| 2,391,388 | Dec. 25, 1945 | E.J. Bullard | Grinding and Lapping Machine | ||
| 2,749,685 | Jun. 12, 1956 | G. Baldwin | Grinding Wheel | ||