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| All Patents in class 439/13 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,108,940 | Sep. 01, 1914 | C.W. Starker | Collector-ring | |
| 2,718,604 | Sep. 20, 1955 | G.H. Herrick | Collector Ring Assembly | ||
| 2,885,915 | May 12, 1959 | G.H. Schurger | Machine Tool Table | ||