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1842 in technology
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Technology in the 1840s
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1840
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Subcategories
This category has the following 4 subcategories, out of 4 total.
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1842 books about technology
(1 C)
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1842 in mining
(4 C)
1842 in rail transport
(7 C, 2 F)
1842 vehicles
(2 C)