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| All Patents in class 315/241R | |||||
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| Number | Date | Patentee | Title | Type | |
| 514,168 | Feb. 06, 1894 | N. Tesla | Means for generating electric currents | ||
| 3,449,631 | Jun. 10, 1969 | J.G. Schreckendgust | Power Control Circuit for Low Voltage Lamps | projectors | |