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| All Patents in class 279/131 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,657,065 | Oct. 27, 1953 | M. De Haas, W.F. Wilhelm | Automatic Chuck | ||
| 2,920,894 | Jan. 12, 1960 | H.C. Kreinick | Quick Acting Tool Holder | ||
| 2,932,524 | Apr. 12, 1960 | R.B. Pealer | Automatic Chuck | ||