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| All Patents in class 384/519 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,188,251 | Jan. 23, 1940 | J.H. Nelson | Preload adjustment for ball bearings | grinders | |
| 2,408,995 | Oct. 08, 1946 | J.J. Osplack | Spindle bearing | metalworking machine bearings | |