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| All Patents in class 439/28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 714,811 | Dec. 02, 1902 | W.D. Litchfield | Brush-holder | motor brush holders | |
| 2,946,731 | Jul. 26, 1960 | J.J. Falls | Method and apparatus for electrolytic shaping | tool grinders | |