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| All Patents in class 223/21 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 9,770X | Jun. 25, 1836 | F. Groening | Palm-leaf hats | ||
 | 53,518 | Mar. 27, 1866 | W. Best, M.S. Drake | Improvement in machines for ironing hats | |
 | 57,437 | Aug. 21, 1866 | M.S. Drake | Improvement in hat-ironing machines | |
| 504,814 | Sep. 12, 1893 | A.E. McDonald | Portable Hat Iron | ||