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| All Patents in class 403/315 | |||||
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| Number | Date | Patentee | Title | Type | |
| 64,931 | May 21, 1867 | C.H. Amidon | Bit-brace | brace chucks | |
| 1,940,455 | Dec. 19, 1933 | A.E. Kilpela | Gear Retaining Means | metalworking machine gearing | |
| 2,231,252 | Feb. 11, 1941 | W.L. Chesterman | Tool Holder | metalworking machine tool holders | |