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| All Patents in class 114/21.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 272,364 | Feb. 13, 1883 | E. Weston | Device for Regulating the Electrical Transmission of Power | electric distribution systems | |
| 613,809 | Nov. 08, 1898 | N. Tesla | Method of and Apparatus for Controlling Mechanism of Moving Vessels or Vehicles | ||