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| All Patents in class 23/303 | |||||
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| Number | Date | Patentee | Title | Type | |
| 109,546 | Nov. 22, 1870 | D. Reynolds, J.W. Paige | Improvement in the manufacture of salt | ||
| 1,141,999 | Jun. 08, 1915 | C.L. Weil | Process for the manufacture of salt | manufacturing salt | |
| 1,273,208 | Jul. 23, 1918 | C.L. Weil | Salt manufacture | manufacturing salt | |