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| All Patents in class 266/218 | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,078X | May 22, 1832 | T. Gregg | Blast furnace for smelting iron ore | steel making furnaces | |
| 9,275X | Dec. 02, 1835 | L.V. Badger | Hot air furnace and cupola | industrial furnaces | |