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| All Patents in class 451/4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,164,642 | Jul. 04, 1939 | J.C. Drader | Method and Means for Constructing Gear Finishing Tools | gear cutting tools | |
| 3,210,853 | Oct. 12, 1965 | J.G. Wiatt | Automatic In-Process Gauge | cylindrical grinders | |
| 3,867,794 | Feb. 25, 1975 | E.G. Robillard | Grinding Machine | internal grinders | |