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| All Patents in class 337/72 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,781,441 | Nov. 11, 1930 | J.R. Cook | Electric switch | electric switches | |
| 1,842,958 | Jan. 26, 1932 | C.H. Chapman, G.R. Townsend | Thermo relay | motor controls | |