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| All Patents in class 318/650 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,183,397 | May 11, 1965 | R.L. Henry | Motor Control Apparatus | motor controls | |
| 3,531,615 | Sep. 29, 1970 | F.X. Zammit | Electrical discharge machining with step driven electrode | electrical discharge machining | |