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| All Patents in class 34/67 | |||||
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| Number | Date | Patentee | Title | Type | |
| 363,335 | May 17, 1887 | W. Hollingsworth, F.X. Hooper | Apparatus for drying coated sheets of paper | ||
| 1,994,220 | Mar. 12, 1935 | A. Hormel | Metal sheet drying oven | ||