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| All Patents in class 384/625 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,917,842 | Jul. 11, 1933 | A.M. Johnson | Drilling machine spindle | drill presses | |
| 3,150,940 | Sep. 29, 1964 | C.O. Graves | Bearing Surface and Method of Producing Said Surface | metalworking machine lubrication | |