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| All Patents in class 318/381 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 789,572 | May 09, 1905 | C.A. Stauffer | Controller for electric motors | |
| 925,355 | Jun. 15, 1909 | B.G. Lamme | Method of and Means for Operating Dynamo Electric Machines | ||