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| All Patents in class 318/258 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,949,727 | Mar. 06, 1934 | J.D. Nies | Electric brake for slip-ring motors | ||
| 2,405,686 | Aug. 13, 1946 | R.H. Clark | Machine Tool | turret lathes | |
| 2,578,648 | Dec. 11, 1951 | A.G. Thomas | Electromagnetic Device | milling machines | |
| 2,737,620 | Mar. 06, 1956 | C.E. Greene | Motor control circuit | ||