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| All Patents in class 337/109 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,180,802 | Nov. 21, 1939 | E.J. Dillman | Control Device | thermostats | |
| 2,218,975 | Oct. 22, 1940 | P.S. Russel | Control Device | temperature controls | |