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Portal:China/Did you know/2

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A modern replica of Zhang Heng's seismometer

Source

[edit]
  1. Wikipedia:Recent additions/2007/September#19 September 2007, Numbered archive of Main Page appearance.
  2. Wikipedia:Recent additions/2009/March#2 March 2009, Numbered archive of Main Page appearance.
  3. Wikipedia:Recent additions/2010/January#16 January 2010, Numbered archive of Main Page appearance.