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| All Patents in class 451/314 | |||||
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| Number | Date | Patentee | Title | Type | |
| 431,517 | Jul. 01, 1890 | H.K. Harker | Pencil-sharpener | pencil sharpeners | |
| 2,258,879 | Oct. 14, 1941 | J.Y. Blazek, V.R. Roy, G.E. Sears | Surfacing machine | gasket surface maintenance | |
| 2,285,377 | Jun. 02, 1942 | J.C. Inman | Surfacing machine | gasket surface maintenance | |