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AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
January 31, 2021
3489481
316915
2

jan 1, 723 - 723 AD - Yi Xing invents the Mechanical Clock

Description:

China

Added to timeline:

5 Nov 2019
0
0
29
Humanities Timeline

Date:

jan 1, 723
Now
~ 1299 years ago
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