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| All Patents in class 237/56 | |||||
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| Number | Date | Patentee | Title | Type | |
| 365,618 | Jun. 28, 1887 | E. Medden | Heater | steam heating | |
| 866,842 | Sep. 24, 1907 | G.S. Comstock | Hot-water heating system | furnaces | |