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