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| All Patents in class 310/248 | |||||
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| Number | Date | Patentee | Title | Type | |
| 345,336 | Jul. 13, 1886 | E. Thomson | Commutator brush | motor brushes | |
| 403,630 | May 21, 1889 | T.L. Wilson | Dynamo Electric Machine | DC motors | |
| 1,395,880 | Nov. 01, 1921 | D.W. Ward | Commutator Brush Reseating Tool | brush reseating tools | |