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| All Patents in class 322/25 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 457,330 | Aug. 04, 1891 | T.E. Adams | Automatic Brush Shifter for Dynamo Electric Machines | ||
 | 613,853 | Nov. 08, 1898 | W.H. Chapman | Electric regulators | |
| 2,163,972 | Jun. 27, 1939 | G.R. Anderson | Control System for Dynamo-Electric Machines | ||
| 2,502,098 | Mar. 28, 1950 | O. Lindfors | Voltage Regulator | ||
 | 3,210,644 | Oct. 05, 1965 | K.M. Sparrow | Dynamo Electric Machine | |
| 3,435,326 | Mar. 25, 1969 | R. Zechlin | Static Exciter Regulator for Generators | ||