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| All Patents in class 279/81 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,279,899 | Apr. 14, 1942 | C.A. Cherry | Tool Holder | drilling and boring tool holders | |
| 3,498,624 | Mar. 03, 1970 | R.G. Koch, E.J. Hammond | Chuck device | drill press chucks | |