Category:11th-century clocks

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Media in category "11th-century clocks"

The following 2 files are in this category, out of 2 total.

Bulletin - United States National Museum (1959) (20481431946).jpg 1,589 × 1,707; 1.27 MB
Clock Tower from Su Song's Book.JPG 1,051 × 1,392; 499 KB

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