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| All Patents in class 210/391 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,346,500 | Apr. 11, 1944 | R.C. Moore | Drying method and apparatus | |
| 3,206,030 | Sep. 14, 1965 | M.R. Estabrook | Vacuum filter | ||