| http://www.w3.org/ns/prov#value | - Before common era, there are odometers and the Antikythera mechanism, an out of place, unique, geared astronomical clock, followed more than a millennium later by early mechanical clocks, geared astrolabes and followed in the 15th century by pedometers ; These machines were all made of toothed gears linked by some sort of carry mechanisms.
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