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| All Patents in class 322/67 | |||||
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| Number | Date | Patentee | Title | Type | |
| 867,154 | Sep. 24, 1907 | W.J. Richards | System of motor control | motor controls | |
| 1,367,298 | Feb. 01, 1921 | J. Burke | Alternating-current motor and generator | AC motors | |