| All Patents in class 310/191 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 324,667 | Aug. 18, 1885 | P. Diehl | Electric motor |
| | 531,790 | Jan. 01, 1895 | R. Eickemeyer | Method of operating or controlling electric motors or dynamos |
 | 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 |
| | 900,420 | Oct. 06, 1908 | A.A. Pifer, C.E. Ahlm | Variable Speed Motor |
 | 1,114,405 | Oct. 20, 1914 | C.H. Smoot | Dynamo-electric machine provided with commutating pole-pieces |
| | 1,983,091 | Dec. 04, 1934 | E.P. Larsh | Variable-speed induction motor |
