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| All Patents in class 34/221 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,330,238 | Feb. 10, 1920 | W.H. Carrier | Method of and apparatus for drying, conditioning, and regulating the moisture content of hygroscopic materials | ||
| 2,230,800 | Feb. 04, 1941 | A. Hormel | Metal sheet drying oven | ||