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| All Patents in class 451/170 | |||||
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| Number | Date | Patentee | Title | Type | |
| 445,349 | Jan. 27, 1891 | W. Bauch | Lens Grinding Machine | glass grinding machines | |
| 1,701,814 | Feb. 12, 1929 | W.J. Maddox | Edge and spindle sander | belt sanders | |
| 2,197,538 | Apr. 16, 1940 | G.W. Binns, A.H. Dall | Metal Finishing Machine | grinding machines | |