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| All Patents in class 318/551 | |||||
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| Number | Date | Patentee | Title | Type | |
| 251,541 | Dec. 27, 1881 | T.A. Edison | Electric Magnetic Motor | motor controls | |
| 892,656 | Jul. 07, 1908 | G.W. Euker | Controller for alternating-current motors | ||