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| All Patents in class 451/220 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,840,958 | Jul. 01, 1958 | C.E. Waller | Automatic Cutter Grinder | tool grinders | |
| 3,101,649 | Aug. 27, 1963 | V.L. Mitchell, H.J. Baldwin, R.W. Nashold | Spiral Milling Machine | milling machines | |
| 5,125,186 | Jun. 30, 1992 | R.L. Schroeder | Drill Grinding Machine | drill grinders | |