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| All Patents in class 384/302 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,171,208 | Aug. 29, 1939 | A.H. Dall, F.S. Haas | High Speed Spindle Construction | ||
| 2,384,589 | Sep. 11, 1945 | W.G. Baldenhofer | Bearing for Rotary Spindles | ||
| 2,653,062 | Sep. 22, 1953 | E. Sperisen | Bearing | ||