| All Patents in class 318/257 |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 295,454 | Mar. 18, 1884 | F.J. Sprague | Electro Dynamic Motor | electric motors |
| 320,630 | Jun. 23, 1885 | L. Daft | Electric Switch | electric switches |
| 321,147 | Jun. 30, 1885 | F.J. Sprague | Electro Dynamic Motor | electric motors |
| 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 | DC motors |
| 1,053,940 | Feb. 18, 1913 | J. Burke | Universal motor | universal motors |
| 1,144,935 | Jun. 29, 1915 | A.L. De Leeuw | Machine Tool Control | machine tool controls |
| 2,845,589 | Jul. 29, 1958 | J.H. Osgood | Electronic Table Motor Drive Unit for Optical Comparators and the Like | comparators |
| 3,586,949 | Jun. 22, 1971 | C.F. Raber, K.D. Spear | Three-Phase Motor Control System | motor controls |
