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| All Patents in class 388/826 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 315,181 | Apr. 07, 1885 | F.J. Sprague | Electric Motor and Generator | ||
| 390,820 | Oct. 09, 1888 | N. Tesla | Regulator for Alternate-Current Motors | ||
 | 673,239 | Apr. 30, 1901 | J. Burke | Regulation and control of electric motors | |
 | 1,227,400 | May 22, 1917 | M. von Dolivo-Dobrowolsky | Electric motor | |
| 2,609,524 | Sep. 02, 1952 | C.E. Greene | Electric Control System | ||
| 3,193,698 | Jul. 06, 1965 | R.M. Henderson, R. Zechlin | Transistor Controlled Speed Shunt | ||