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| All Patents in class 451/558 | |||||
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| Number | Date | Patentee | Title | Type | |
| 41,646 | Feb. 16, 1864 | D. Slate | Improved apparatus for grinding cutter-bits for rifling-machines | ||
| 189,483 | Apr. 10, 1877 | M.H. McNair | Devices for Fitting and Polishing Cylinders and Rings | mandrels and arbors | |
| 2,442,088 | May 25, 1948 | C. Kreutzer | Dressing Tool Holder | grinder dressers | |