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| All Patents in class 384/517 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,188,251 | Jan. 23, 1940 | J.H. Nelson | Preload adjustment for ball bearings | ||
 | 2,779,883 | Jan. 29, 1957 | H.W. Schumann | Motor tool | |
| 3,222,991 | Dec. 14, 1965 | K.F. Bone | Bearing Preload Mechanism for Machine Tool | ||
| 3,945,694 | Mar. 23, 1976 | B.D. Vaillette | Toolhead | ||