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| All Patents in class 422/422 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,293X | Dec. 04, 1828 | E. Clarke | Manufacture of metallic salts | ||
| 8,162X | Apr. 23, 1834 | F. Fossard | Dying with alkaline prussiates, manufacturing potash | manufacturing potash | |