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| All Patents in class 338/184 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,201,921 | Oct. 17, 1916 | C.H. Beach | Rheostat | sewing machines | |
| 1,369,407 | Feb. 22, 1921 | F. Diehl | Rheostat | ||
| 1,552,373 | Sep. 01, 1925 | B.F. Winterhoff | Electric gauge for gasoline tanks | motor vehicles | |