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| All Patents in class 451/38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,072,629 | Sep. 09, 1913 | T. Lumsden | Tool Holder for Grinding Machines | sharpening tool holders | |
| 1,925,808 | Sep. 05, 1933 | W.A. Kelsey | Dental Tool Holder | dental tools | |