The abacus was invented by the Sumerians in 2,700 BCE, not in 1642 ACE
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The abacus was invented to help people calculate.
The abacus was invented before cameras and so no photograph exists.
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the country that invented the abacus is China Actually it is unknown as the abacus seems to predate recorded history and different versions were independently invented in various places.
Abacus was invented by the Chinesethe abacus was also known as the first computer