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| All Patents in class 290/4R | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,838,298 | Jun. 10, 1958 | R.M. Henderson | Isolation and Engine Speed Limit Controller | ||
| 2,885,566 | May 05, 1959 | R.H. Eisengrein, G.G. Hermanson, C.L. Sadler | Control means | ||
| 2,900,527 | Aug. 18, 1959 | E.W. Erikson | Generator control system | ||
| 3,305,762 | Feb. 21, 1967 | C.E. Geib, Jr. | Method of control of electric power | ||