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| All Patents in class 322/55 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 294,095 | Feb. 26, 1884 | E. Thomson | Electric Power Distribution System | |
| 323,976 | Aug. 11, 1885 | E. Thomson | Automatic commutator adjuster for dynamo electric machines | ||
| 336,780 | Feb. 23, 1886 | R.E. Ball | Dynamo Electric Machine | ||
| 350,954 | Oct. 19, 1886 | N. Tesla | Regulator for Dynamo-Electric Machines | ||
| 457,330 | Aug. 04, 1891 | T.E. Adams | Automatic Brush Shifter for Dynamo Electric Machines | ||