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| All Patents in class 338/153 | |||||
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| Number | Date | Patentee | Title | Type | |
| 649,972 | May 22, 1900 | T.S. Watson | Electric-motor-controlling device | dental apparatus | |
| 1,201,921 | Oct. 17, 1916 | C.H. Beach | Rheostat | sewing machines | |
| 1,478,701 | Dec. 25, 1923 | F. Diehl | Controller for sewing-machine motors | ||