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| All Patents in class 310/113 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,298,966 | Apr. 01, 1919 | J.S. Knowlson | Electrically-operated tool | |
| 1,978,688 | Oct. 30, 1934 | E.W. Petersen | Motor Generator Assembly | ||
| 2,023,245 | Dec. 03, 1935 | T. Schou | Frequency Changer | ||
 | 2,102,481 | Dec. 14, 1937 | C.W. Noe | Dynamo motor | |