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| All Patents in class 310/56 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,300,243 | Apr. 15, 1919 | A.L. Broomall | Dynamo-electric machine | motor cooling | |
| 1,743,134 | Jan. 14, 1930 | W.C. Hammond, H.J. Kingsbury | Motor-driven machine | ||
| 1,750,446 | Mar. 11, 1930 | J.D. Wallace, C.H. Landis | Dynamo-electric machine | electric motors | |
| 2,390,297 | Dec. 04, 1945 | H.L. Gilmore | Gas purification | ||