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| All Patents in class 318/250 | |||||
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| Number | Date | Patentee | Title | Type | |
| 649,972 | May 22, 1900 | T.S. Watson | Electric-motor-controlling device | dental apparatus | |
| 1,227,400 | May 22, 1917 | M. von Dolivo-Dobrowolsky | Electric motor | synchronous motors | |