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| All Patents in class 310/261.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 471,155 | Mar. 22, 1892 | E. Thomson | Alternating Current Motor | AC motors | |
| 2,012,021 | Aug. 20, 1935 | E.W. Petersen | Method of Forming Rotors | electric motor making | |