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Seismograph was invented (jan 30, 132 – may 5, 135)
Description:
An instrument that measures and records details of earthquakes,
Added to timeline:
Han Dynasty
By
Sydney Atkins 2020
12 Nov 2017
0
0
610
Date:
jan 30, 132
may 5, 135
~ 3 years and 3 months
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