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| All Patents in class 322/30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 294,095 | Feb. 26, 1884 | E. Thomson | Electric Power Distribution System | electric distribution systems | |
| 2,598,124 | May 27, 1952 | J.K. Stotz, G.T. Holt | Power Plant Regulation | power plants | |