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| All Patents in class 81/491 | |||||
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| Number | Date | Patentee | Title | Type | |
| 360,854 | Apr. 12, 1887 | W. Millspaugh, G.N. Clemson | Tool-Holder | compass saws | |
| 1,361,021 | Dec. 07, 1920 | L.G. Copeman | Tool Holder | tool holders | |