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| All Patents in class 337/307 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,209,767 | Jul. 30, 1940 | E.J. Dillman | Thermostat | thermostats | |
| 2,266,975 | Dec. 23, 1941 | W.S. Landon | Control Device | flow controls | |