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| All Patents in class 451/50 | |||||
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| Number | Date | Patentee | Title | Type | |
| 525,441 | Sep. 04, 1894 | W. Brunner | Valve Reseating Machine | valve reseating machines | |
| 2,377,982 | Jun. 12, 1945 | J. Decker, G.W. Binns, F.J. Theler | Grinding Machine and Method of Grinding | centerless grinders | |
| 2,438,239 | Mar. 23, 1948 | H.A. Toulmin, Jr. | Ball Grinding Machine | grinding machines | |