| All Patents in class 318/257 |
Patents 1 -
9
of 9
      |
| Picture | Number | Date | Patentee | Title |
| | 295,454 | Mar. 18, 1884 | F.J. Sprague | Electro Dynamic Motor |
| | 320,630 | Jun. 23, 1885 | L. Daft | Electric Switch |
| | 321,147 | Jun. 30, 1885 | F.J. Sprague | Electro Dynamic Motor |
| | 700,310 | May 20, 1902 | R. Eickemeyer | Alternating-current electric motor and controlling means therefor |
| | 1,043,325 | Nov. 05, 1912 | J.C. Lincoln | Variable Speed Electric Motor |
 | 1,053,940 | Feb. 18, 1913 | J. Burke | Universal motor |
| | 1,144,935 | Jun. 29, 1915 | A.L. De Leeuw | Machine Tool Control |
| | 2,845,589 | Jul. 29, 1958 | J.H. Osgood | Electronic Table Motor Drive Unit for Optical Comparators and the Like |
| | 3,586,949 | Jun. 22, 1971 | K.D. Spear, C.F. Raber | Three-Phase Motor Control System |
