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| All Patents in class 318/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 715,019 | Dec. 02, 1902 | F.E. Case | Means for Synchronizing Motors | motor controls | |
| 715,195 | Dec. 02, 1902 | F.E. Case | Method of Synchronizing Motors | motor controls | |