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| All Patents in class 388/835 | |||||
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| Number | Date | Patentee | Title | Type | |
| 372,231 | Oct. 25, 1887 | A.W. Meston | Regulator for electric motors | electric motors | |
| 597,418 | Jan. 18, 1898 | F.A. Johnson | Regulation of dynamo-electric machinery | electric motors | |
| 672,419 | Apr. 16, 1901 | F.A. Johnson | Means for Controlling Electric Motors | motor controls | |
| 1,194,645 | Aug. 15, 1916 | J.C. Lincoln | Variable Speed Electric Motor | DC motors | |
| 1,976,048 | Oct. 09, 1934 | H.B. Tuthill, H.F. Caldwell | Motor driven lathe head | wood lathes | |