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| All Patents in class 477/13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 792,684 | Jun. 20, 1905 | T.S. Watson | Electric motor | electric motors | |
| 1,166,974 | Jan. 04, 1916 | A.L. De Leeuw | Machine Tool Control | machine tool controls | |
| 1,665,742 | Apr. 10, 1928 | F.S. Kingston | Induction motor | induction motors | |
| 1,864,654 | Jun. 28, 1932 | F.S. Kingston, B.L. Conley | Electric switch | electric switches | |
| 1,935,800 | Nov. 21, 1933 | F.S. Kingston | Electric motor | electric motors | |