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| All Patents in class 337/314 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,994,988 | Mar. 19, 1935 | L.W. Eggleston | Control Device | ||
| 2,266,975 | Dec. 23, 1941 | W.S. Landon | Control Device | ||
| 2,589,063 | Mar. 11, 1952 | E.J. Dillman | Thermostatic Switch | ||