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| All Patents in class 318/269 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,949,727 | Mar. 06, 1934 | J.D. Nies | Electric brake for slip-ring motors | |
| 2,546,692 | Mar. 27, 1951 | R.B. Lesher, C.E. Greene | Control System | ||
| 2,578,648 | Dec. 11, 1951 | A.G. Thomas | Electromagnetic Device | ||