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| All Patents in class 310/425 | |||||
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| Number | Date | Patentee | Title | Type | |
| 302,556 | Jul. 29, 1884 | W.K. Freeman | Field of Force Magnet for Dynamo Electric Machines | electric generators | |
| 413,337 | Oct. 22, 1889 | R. Eickemeyer | Dynamo-electric machine | ||
| 491,695 | Feb. 14, 1893 | J.J. Wood | Alternating Current Dynamo Electric Machine | electric generators | |