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| All Patents in class 411/531 | |||||
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| Number | Date | Patentee | Title | Type | |
| 385,845 | Jul. 10, 1888 | W.S. Cobb | Tool Post Ring | lathe tool holders and tool posts | |
| 775,134 | Nov. 15, 1904 | K.C. Gillette | Razor | specialty tools | |
| 981,315 | Jan. 10, 1911 | G.E. Rogers | Means for preventing frictional drag on rotating screw-heads | ratchet braces | |
| 1,333,707 | Mar. 16, 1920 | C.A. Dies | Lathe Dog and the Like | lathe dogs | |
| 2,151,255 | Mar. 21, 1939 | E.J. Witchger | Spring Nut | ||