Assertion: abacus | /r/HasProperty | invented in china
Facets:
value: in 500 bc
type: TEMPORAL
Source sentences:
text: The abacus was invented in China, around 1300 BC.
text: Abacus was invented by Chinese in 500 BC (while some indications argue on its invention by Babylonians in 300 BC) and was used as one of the most primitive calculators (or counting device to be precise).