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| All Patents in class 388/852 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 485,620 | Nov. 08, 1892 | J.P. Fiske | Electric Motor Controller | ||
| 500,274 | Jun. 27, 1893 | W.L. Tyler, A.B. See | Regulating Switch for Electric Elevators | ||
 | 740,101 | Sep. 29, 1903 | W.A. Dick | Method of operating electric motors | |
 | 793,848 | Jul. 04, 1905 | C.S. Reno | Electric controller | |
| 1,112,784 | Oct. 06, 1914 | E.L. Gale, Sr. | Means for Controlling Electric Currents | ||