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| All Patents in class 318/681 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,067,337 | Dec. 04, 1962 | C.J. Bowman | Servo Amplifier Using Push-Pull Complementary Cascafed Transistors with Means to Superimpose a Higher A. C. Frequency on Information Signal | machine tool controls | |