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| All Patents in class 337/404 | |||||
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| Number | Date | Patentee | Title | Type | |
| 471,130 | Mar. 22, 1892 | M. Martin | Thermostatic Instrument | electrical fuses | |
| 2,172,823 | Sep. 12, 1939 | A. Von Wangenheim | Control Device | temperature controls | |