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| All Patents in class 337/320 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,168,545 | Aug. 08, 1939 | D.D. Wile | Control Device | ||
| 2,209,767 | Jul. 30, 1940 | E.J. Dillman | Thermostat | ||
| 2,239,146 | Apr. 22, 1941 | J.E. Fleury, E.J. Dillman | Control Device | ||
| 2,259,645 | Oct. 21, 1941 | W.S. Landon | Heating System and Control Means Therefor | ||
| 2,266,975 | Dec. 23, 1941 | W.S. Landon | Control Device | ||