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| All Patents in class 318/831 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,983,091 | Dec. 04, 1934 | E.P. Larsh | Variable-speed induction motor | induction motors | |
| 2,351,878 | Jun. 20, 1944 | P.S. Russel | Controlling Means | flow controls | |