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| All Patents in class 338/190 | |||||
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| Number | Date | Patentee | Title | Type | |
| 372,012 | Oct. 25, 1887 | I.W. Colburn | Electrical resistance-board | electrical devices | |
| 1,437,629 | Dec. 05, 1922 | H.L. Zabriskie | Rheostat | ||
| 1,552,373 | Sep. 01, 1925 | B.F. Winterhoff | Electric gauge for gasoline tanks | motor vehicles | |