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| All Patents of Type: magnetic coils | |||||
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| Number | Date | Patentee | Title | Type | |
| 410,468 | Sep. 03, 1889 | E. Rice, Jr., E. Thomson | Reactive and Induction Coil | magnetic coils | |
| 1,696,615 | Dec. 25, 1928 | P. Trombetta | Electromagnet | motor controls | |