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| All Patents in class 279/69 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,606,972 | Nov. 16, 1926 | H. Nielsen | Chuck | drill press chucks | |
| 1,702,810 | Feb. 19, 1929 | J.F. Buhr | Tapping Chuck | drill press chucks | |