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| All Patents in class 307/149 | |||||
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| Number | Date | Patentee | Title | Type | |
| 593,138 | Nov. 02, 1897 | N. Tesla | Electrical transformer | ||
| 1,201,837 | Oct. 17, 1916 | J.C. Lincoln | Portable Means for Securing the Reverse Flow of Electric Current | electrical devices | |
| 2,515,146 | Jul. 11, 1950 | F.C. Victory | Means for Maintaining Dimensional Stability in Machine Parts | metalworking machine mechanisms | |