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| All Patents in class 327/518 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,854,613 | Sep. 30, 1958 | J.R. Mowery | Motor control system | |
| 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 | ||
| 3,095,530 | Jun. 25, 1963 | W.H. Woodward | Digital Control Apparatus for Ward-Leonard Electrical Machines | ||