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| Patents for Stephen Hempstead Jr. | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,769X | May 25, 1827 | S. Hempstead, Jr. | Water proof stiffening for hats | ||
| 4,909X | Oct. 26, 1827 | S. Hempstead, Jr. | Water-proof stiffening for hats | ||