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| All Patents in class 451/431 | |||||
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| Number | Date | Patentee | Title | Type | |
| 126,522 | May 07, 1872 | W.E. Cooper | Improvement in Devices for Boring Spherical Seats | drilling and boring tool holders | |
| 801,350 | Oct. 10, 1905 | T.B. Williams | Valve-reseating machine | automotive tools | |
| 1,981,269 | Nov. 20, 1934 | J.W. Holland | Valve seat grinder | valve and seat maintenance | |
| 2,318,854 | May 11, 1943 | E.A. Hall | Portable Valve Seat Grinding Means | valve grinding tools | |