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| All Patents in class 318/55 | |||||
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| Number | Date | Patentee | Title | Type | |
| 520,748 | May 29, 1894 | J.S. Bancroft | Method of Operating Electric Motors | motor controls | |
| 2,131,107 | Sep. 27, 1938 | A.L. Krause | Grinding Machine | surface grinders | |
| 2,651,746 | Sep. 08, 1953 | J.J. Gano | Control Device | milling machines | |