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1820s patents
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19th-century patents
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1810s
1820s
1830s
1840s
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Subcategories
This category has the following 6 subcategories, out of 6 total.
1821 patents
(2 C, 1 F)
1824 patents
(1 C)
1825 patents
(1 C)
1826 patents
(1 F)
1828 patents
(1 F)
1829 patents
(1 C, 3 F)