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| All Patents in class 451/53 | |||||
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| Number | Date | Patentee | Title | Type | |
| 416,873 | Dec. 10, 1889 | B.C. Tilghman | Cutting Metals by Electricity | electrical discharge machining | |
| 2,384,225 | Sep. 04, 1945 | J.C. Wilson | Method and Apparatus for Maintaining Uniform Temperature of Diverse Fluids in a Machine Tool | metalworking machine mechanisms | |
| 4,499,693 | Feb. 19, 1985 | M.J. Carroll, J.J. Fatula, Sr. | Method of grinding non-uniform workpieces | metal sanding machines | |