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| All Patents in class 388/913 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,082,496 | Jun. 01, 1937 | W.H. Howe | Voltage Regulation and Circuits Therefor | ||
| 2,609,524 | Sep. 02, 1952 | C.E. Greene | Electric Control System | ||
| 2,864,047 | Dec. 09, 1958 | W.H. Ulman, C.E. Greene | Motor control system | ||