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| All Patents in class 337/107 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,842,958 | Jan. 26, 1932 | G.R. Townsend, C.H. Chapman | Thermo relay | |
 | 1,854,007 | Apr. 12, 1932 | L.J. Weber | Thermal relay | |
| 2,180,802 | Nov. 21, 1939 | E.J. Dillman | Control Device | ||