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| All Patents in class 279/36 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,606,972 | Nov. 16, 1926 | H. Nielsen | Chuck | drill press chucks | |
| 1,758,261 | May 13, 1930 | J.A. Leland | Tool and article holder | drill bit extensions | |
| 1,880,521 | Oct. 04, 1932 | A.L. Stowell | Bit or drill holder | ||