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| All Patents in class 451/320 | |||||
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| Number | Date | Patentee | Title | Type | |
| 54,161 | Apr. 24, 1866 | F. Hoffman | Improvement in machines for polishing wood | sanding machines | |
| 1,307,577 | Jun. 24, 1919 | F.H. Chapman | Machine for Grooving and Finishing Jewel Bearings | metal shaper accessories | |
| 2,164,067 | Jun. 27, 1939 | W.M. Fairbairn, A.M. Johnson | Machine for dressing external cylindrical surfaces | ||
| 2,209,307 | Jul. 30, 1940 | F. Esz, A.H. Dall | Surface Finishing Machine | grinding machines | |