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| All Patents in class 310/138 | |||||
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| Number | Date | Patentee | Title | Type | |
| 660,908 | Oct. 30, 1900 | B.G. Lamme | Variable-speed electric motor | DC motors | |
| 1,201,837 | Oct. 17, 1916 | J.C. Lincoln | Portable Means for Securing the Reverse Flow of Electric Current | electrical devices | |
| 1,298,966 | Apr. 01, 1919 | J.S. Knowlson | Electrically-operated tool | impact riveters | |