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| Patents for Charles Steinmetz | |||||
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| Number | Date | Patentee | Title | Type | |
| 450,367 | Apr. 14, 1891 | R. Eickemeyer | Insulation of armatures for dynamo-electric machines | ||
| 531,790 | Jan. 01, 1895 | R. Eickemeyer | Method of operating or controlling electric motors or dynamos | ||