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