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| All Patents in class 432/145 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,230,800 | Feb. 04, 1941 | A. Hormel | Metal sheet drying oven | ||
 | 3,994,678 | Nov. 30, 1976 | J.W. Nelson | Heater for billets | |
 | 4,065,249 | Dec. 27, 1977 | J.W. Nelson | Heater for billets | |