the abacus as we know today appeared circa 1200 A.D. in
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If you are attempting to find the total amount of time, you would add the BC years to the AD years. 1200 BC would be 1200 + 2009 = 3209 years ago.
The first gun powder-powered weapons.
Gunpowder was invented in china around 800ad and leaked out at 1200 ad to europe
An Abacus has beads and strings.
1200 B.C. to 300 B.C.