| All Patents in class 451/320 |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 54,161 | Apr. 24, 1866 | F. Hoffman | Improvement in machines for polishing wood | sanding machines |
| 431,517 | Jul. 01, 1890 | H.K. Harker | Pencil-sharpener | pencil sharpeners |
| 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 | A.M. Johnson, W.M. Fairbairn | Machine for dressing external cylindrical surfaces | |
| 2,209,307 | Jul. 30, 1940 | F. Esz, A.H. Dall | Surface Finishing Machine | grinding machines |
