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| All Patents in class 338/301 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 559,349 | May 05, 1896 | W.S. Andrews | Rheostat | |
 | 928,394 | Jul. 20, 1909 | H.I. Finch, C.R. Meston | Rheostat | |
| 1,369,407 | Feb. 22, 1921 | F. Diehl | Rheostat | ||
| 1,437,629 | Dec. 05, 1922 | H.L. Zabriskie | Rheostat | ||