Category:1869 in technology
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This category has the following 5 subcategories, out of 5 total.
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Media in category "1869 in technology"
The following 2 files are in this category, out of 2 total.
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Campione del metro, Giuseppe Spano e figlio, Napoli, 1869.jpg 4,083 × 464; 182 KB
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Cros - Solution générale du problème de la photographie des couleurs, 1869.djvu 4,267 × 6,400, 14 pages; 561 KB