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| Category:History of technology |
| Modification date "Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
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18:26:43, 11 October 2012 + |
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| Subcategory of | Technology + , History by topic + |
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| Category:Introductions by century + | Subcategory of |
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