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| All Patents in class 323/340 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,115,835 | Nov. 03, 1914 | J.D. Nies, A. Kimble | Electric controller | electrical devices | |
| 3,177,423 | Apr. 06, 1965 | H.M. Fuldner | Trigonometric Store | machine tool controls | |