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| All Patents in class 34/225 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,994,220 | Mar. 12, 1935 | A. Hormel | Metal sheet drying oven | ||
| 2,346,500 | Apr. 11, 1944 | R.C. Moore | Drying method and apparatus | ||
| 2,627,838 | Feb. 10, 1953 | P. Huggins | Apparatus for Impregnating Solid Bodies | motor winding impregnating apparatus | |