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| All Patents in class 384/255 | |||||
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| Number | Date | Patentee | Title | Type | |
| 632,666 | Sep. 05, 1899 | F. Wilkie | Commutator Grinding Rig | commutator dressing machines | |
| 1,257,548 | Feb. 26, 1918 | W.S. Thomson | Grinding and Polishing Machine | polishing and buffing machinery | |
| 1,599,600 | Sep. 14, 1926 | W.O. Vivarttas | Bearing support for machine tools | woodworking machine mechanisms | |