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| All Patents in class 185/39 | |||||
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| Number | Date | Patentee | Title | Type | |
| 744,295 | Nov. 17, 1903 | W.U. Colthar | Spring-motor | sewing machines | |
| 986,695 | Mar. 14, 1911 | F.R. Cunningham | Mainspring Winder | watchmaker | |
| 2,568,136 | Sep. 18, 1951 | W.H. Weimer | Starter motor using spring power | starters | |