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| All Patents in class 423/421 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 6,633X | Jul. 20, 1831 | E. Parce | Manufacturing pot ash and leaching ashes | ||
| 8,967X | Jul. 17, 1835 | M. Hartsuff, M. French | Manufacture of potash | ||