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| All Patents in class 403/68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 103,462 | May 24, 1870 | I. Holliday | Bit-stock | brace chucks | |
| 872,903 | Dec. 03, 1907 | P.F. Connelly | Adjustable Tool Holder | mason | |