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| All Patents in class 74/406 | |||||
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| Number | Date | Patentee | Title | Type | |
| 297,383 | Apr. 22, 1884 | H. Hobbs, E.F. Gordon | Suspended drilling-machine | radial drill presses | |
| 1,684,344 | Sep. 11, 1928 | J.C. Carlton | Trasmission for Radial Drill Arms, Elevating Mechanism and Drill Spindles | radial drill presses | |
| 3,220,276 | Nov. 30, 1965 | E.C. Bruns | Position Analog Unit for Automatic Controls | machine tool controls | |