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| All Patents in class 200/12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 485,620 | Nov. 08, 1892 | J.P. Fiske | Electric Motor Controller | motor controls | |
| 1,041,859 | Oct. 22, 1912 | T.W. Nowell | Motor Controlling Device | motor controls | |
| 1,043,942 | Nov. 12, 1912 | A. Kimble | No-voltage release mechanism | electric motors | |