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| All Patents in class 310/228 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 518,913 | Apr. 24, 1894 | G.W. Brown | Commutator-brush | ||
| 750,479 | Jan. 26, 1904 | P.F. McCormick | Car Wheel Grinding Device | ||
 | 1,116,871 | Nov. 10, 1914 | D.M. Bliss | Method and means for reducing sparking in electrical apparatus | |