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| All Patents in class 34/223 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,247,798 | Nov. 27, 1917 | W. Dohn | Clothes-drying tumbler-machine | ||
| 1,751,472 | Mar. 25, 1930 | A.A. Criqui | Drying process and apparatus | ||