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| All Patents in class 451/320 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 54,161 | Apr. 24, 1866 | F. Hoffman | Improvement in machines for polishing wood | |
| 431,517 | Jul. 01, 1890 | H.K. Harker | Pencil-sharpener | ||
 | 1,307,577 | Jun. 24, 1919 | F.H. Chapman | Machine for Grooving and Finishing Jewel Bearings | |
| 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 | ||