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| All Patents of Type: electrical overload relays | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,531,722 | Mar. 31, 1925 | F.O. Adams | Time-Limit Overload Relay for Electric Circuits | electrical overload relays | |
| 1,842,958 | Jan. 26, 1932 | C.H. Chapman, G.R. Townsend | Thermo relay | motor controls | |
| 1,854,007 | Apr. 12, 1932 | L.J. Weber | Thermal relay | motor controls | |