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| All Patents in class 338/51 | |||||
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| Number | Date | Patentee | Title | Type | |
| 559,349 | May 05, 1896 | W.S. Andrews | Rheostat | rheostats | |
| 1,011,919 | Dec. 19, 1911 | H.W. Cheney | System of motor control | motor controls | |