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History
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Straightedge and compass
Straightedge and compass
A compass
A compass
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A variety of rulers
A variety of rulers
Retractable flexible rule or tape measure
Retractable flexible rule or tape measure
A closeup of a steel ruler
A closeup of a steel ruler
Bronze ruler. Han dynasty, 206 BC – 220 AD. Excavated in Zichang County, China
Bronze ruler. Han dynasty, 206 BC – 220 AD. Excavated in Zichang County, China