Category:1840s patents
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Subcategories
This category has the following 5 subcategories, out of 5 total.
- 1840 patents (3 F)
- 1844 patents (1 F)
Media in category "1840s patents"
The following 2 files are in this category, out of 2 total.
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Brevet d'invention Arhome 1.jpg 1,520 × 2,192; 860 KB
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Continuous casting Laing patent US3023.png 2,232 × 1,426; 253 KB