Category:1840 patents
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Media in category "1840 patents"
The following 3 files are in this category, out of 3 total.
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Continuous casting Sellers patent US1908.png 2,502 × 1,419; 71 KB
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PennyEncyclopediaWornumFig9.svg 675 × 194; 45 KB
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US Patent Drawing for Hotchkiss doorknob.jpg 1,730 × 2,052; 200 KB