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| All Patents in class 91/314 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,580,094 | Apr. 06, 1926 | A. White | Tool-operating machine | |
| 1,763,142 | Jun. 10, 1930 | W. Ernst | Hydraulic Press | ||
| 2,178,850 | Nov. 07, 1939 | A.H. Dall | Spindle Oscillator | ||