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| All Patents in class 310/233 | |||||
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| Number | Date | Patentee | Title | Type | |
| 473,567 | Apr. 26, 1892 | C.G. Curtis | Commutator Connection for Electric Motors or Generators | electric motors | |
| 2,188,170 | Jan. 23, 1940 | H.M. Zachau | Armature | electric motors | |