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| All Patents in class 451/358 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,453,020 | Nov. 02, 1948 | J.B. Koett | Lathe grinding device | metal lathe accessories and attachments | |
| 2,545,453 | Mar. 20, 1951 | F.P. Forss | Portable rotary grinder or die filer | handheld power tools | |
| 4,866,319 | Sep. 12, 1989 | M.W. Crutchfield | Erasing machine | draftsman | |